feat(doubleclicksearch)!: update the API

BREAKING CHANGE: This release has breaking changes.
#### doubleclicksearch:v2
The following keys were deleted:
- etag
- parameters.userIp.description
- parameters.userIp.location
- parameters.userIp.type
- resources.conversion.methods.updateAvailability.request.parameterName
- resources.reports.methods.generate.request.parameterName
- resources.reports.methods.request.request.parameterName
- schemas.Conversion.properties.conversionTimestamp.format
- schemas.Conversion.properties.revenueMicros.format
- schemas.ConversionList.properties.kind.default
- schemas.Report.properties.kind.default
- schemas.ReportApiColumnSpec.properties.groupByColumn.default
- schemas.ReportRequest.properties.includeDeletedEntities.default
- schemas.ReportRequest.properties.includeRemovedEntities.default
- schemas.ReportRequest.properties.maxRowsPerFile.maximum
- schemas.ReportRequest.properties.maxRowsPerFile.minimum
- schemas.ReportRequest.properties.rowCount.default
- schemas.ReportRequest.properties.rowCount.maximum
- schemas.ReportRequest.properties.rowCount.minimum
- schemas.ReportRequest.properties.startRow.default
- schemas.ReportRequest.properties.startRow.maximum
- schemas.ReportRequest.properties.startRow.minimum
- schemas.ReportRequest.properties.timeRange.properties.changedAttributesSinceTimestamp.format
- schemas.ReportRequest.properties.timeRange.properties.changedMetricsSinceTimestamp.format
- schemas.ReportRequest.properties.verifySingleTimeZone.default
- schemas.SavedColumn.properties.kind.default
- schemas.SavedColumnList.properties.kind.default

The following keys were added:
- canonicalName
- mtlsRootUrl
- parameters.$.xgafv.description
- parameters.$.xgafv.enum
- parameters.$.xgafv.enumDescriptions
- parameters.$.xgafv.location
- parameters.$.xgafv.type
- parameters.access_token.description
- parameters.access_token.location
- parameters.access_token.type
- parameters.callback.description
- parameters.callback.location
- parameters.callback.type
- parameters.uploadType.description
- parameters.uploadType.location
- parameters.uploadType.type
- parameters.upload_protocol.description
- parameters.upload_protocol.location
- parameters.upload_protocol.type
- resources.conversion.methods.get.flatPath
- resources.conversion.methods.insert.flatPath
- resources.conversion.methods.insert.parameterOrder
- resources.conversion.methods.update.flatPath
- resources.conversion.methods.update.parameterOrder
- resources.conversion.methods.updateAvailability.flatPath
- resources.conversion.methods.updateAvailability.parameterOrder
- resources.reports.methods.generate.flatPath
- resources.reports.methods.generate.parameterOrder
- resources.reports.methods.get.flatPath
- resources.reports.methods.getFile.flatPath
- resources.reports.methods.request.flatPath
- resources.reports.methods.request.parameterOrder
- resources.savedColumns.methods.list.flatPath

The following keys were changed:
- baseUrl
- description
- documentationLink
- icons.x16
- icons.x32
- parameters.alt.description
- parameters.alt.enum
- parameters.alt.enumDescriptions
- parameters.quotaUser.description
- resources.conversion.methods.get.parameters.startDate.description
- resources.conversion.methods.get.path
- resources.conversion.methods.insert.path
- resources.conversion.methods.update.path
- resources.conversion.methods.updateAvailability.description
- resources.conversion.methods.updateAvailability.path
- resources.reports.methods.generate.path
- resources.reports.methods.get.path
- resources.reports.methods.getFile.path
- resources.reports.methods.request.path
- resources.savedColumns.methods.list.path
- schemas.Availability.properties.availabilityTimestamp.format
- schemas.Availability.properties.segmentationId.description
- schemas.Availability.properties.segmentationName.description
- schemas.Availability.properties.segmentationType.description
- schemas.Conversion.properties.attributionModel.description
- schemas.Conversion.properties.channel.description
- schemas.Conversion.properties.conversionId.description
- schemas.Conversion.properties.conversionModifiedTimestamp.format
- schemas.Conversion.properties.countMillis.description
- schemas.Conversion.properties.currencyCode.description
- schemas.Conversion.properties.customDimension.description
- schemas.Conversion.properties.inventoryAccountId.description
- schemas.Conversion.properties.productCountry.description
- schemas.Conversion.properties.productLanguage.description
- schemas.Conversion.properties.revenueMicros.description
- schemas.Conversion.properties.segmentationId.description
- schemas.Conversion.properties.segmentationName.description
- schemas.Conversion.properties.segmentationType.description
- schemas.Conversion.properties.state.description
- schemas.Conversion.properties.storeId.description
- schemas.Conversion.properties.type.description
- schemas.ConversionList.properties.kind.description
- schemas.CustomDimension.description
- schemas.CustomMetric.description
- schemas.Report.description
- schemas.Report.properties.files.description
- schemas.Report.properties.isReportReady.description
- schemas.Report.properties.kind.description
- schemas.Report.properties.request.description
- schemas.Report.properties.statisticsCurrencyCode.description
- schemas.Report.properties.statisticsTimeZone.description
- schemas.ReportApiColumnSpec.properties.customDimensionName.description
- schemas.ReportApiColumnSpec.properties.customMetricName.description
- schemas.ReportApiColumnSpec.properties.endDate.description
- schemas.ReportApiColumnSpec.properties.groupByColumn.description
- schemas.ReportApiColumnSpec.properties.headerText.description
- schemas.ReportApiColumnSpec.properties.platformSource.description
- schemas.ReportApiColumnSpec.properties.productReportPerspective.description
- schemas.ReportApiColumnSpec.properties.savedColumnName.description
- schemas.ReportApiColumnSpec.properties.startDate.description
- schemas.ReportRequest.properties.columns.description
- schemas.ReportRequest.properties.downloadFormat.description
- schemas.ReportRequest.properties.filters.description
- schemas.ReportRequest.properties.filters.items.properties.column.description
- schemas.ReportRequest.properties.filters.items.properties.operator.description
- schemas.ReportRequest.properties.filters.items.properties.values.description
- schemas.ReportRequest.properties.includeDeletedEntities.description
- schemas.ReportRequest.properties.includeRemovedEntities.description
- schemas.ReportRequest.properties.maxRowsPerFile.description
- schemas.ReportRequest.properties.orderBy.description
- schemas.ReportRequest.properties.orderBy.items.properties.column.description
- schemas.ReportRequest.properties.orderBy.items.properties.sortOrder.description
- schemas.ReportRequest.properties.reportScope.description
- schemas.ReportRequest.properties.reportType.description
- schemas.ReportRequest.properties.rowCount.description
- schemas.ReportRequest.properties.startRow.description
- schemas.ReportRequest.properties.statisticsCurrency.description
- schemas.ReportRequest.properties.timeRange.description
- schemas.ReportRequest.properties.timeRange.properties.changedAttributesSinceTimestamp.description
- schemas.ReportRequest.properties.timeRange.properties.changedMetricsSinceTimestamp.description
- schemas.ReportRequest.properties.verifySingleTimeZone.description
- schemas.SavedColumn.properties.kind.description
- schemas.SavedColumnList.description
- schemas.SavedColumnList.properties.kind.description