Add security monitoring to clients

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#393

[jirikuncar]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #306 into master will increase coverage by 0.24%.
The diff coverage is 76.78%.

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/datadog/api/v1/client/ApiException.java	41.37% <ø> (ø)	4.00 <0.00> (ø)
...in/java/com/datadog/api/v1/client/ApiResponse.java	90.00% <ø> (ø)	4.00 <0.00> (ø)
...ain/java/com/datadog/api/v1/client/StringUtil.java	18.18% <0.00%> (ø)	1.00 <0.00> (ø)
...ava/com/datadog/api/v1/client/auth/ApiKeyAuth.java	37.50% <ø> (ø)	3.00 <0.00> (ø)
.../com/datadog/api/v1/client/auth/HttpBasicAuth.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...com/datadog/api/v1/client/auth/HttpBearerAuth.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../datadog/api/v1/client/auth/HttpSignatureAuth.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...va/com/datadog/api/v1/client/model/LogContent.java	22.72% <ø> (ø)	8.00 <0.00> (ø)
...main/java/com/datadog/api/v2/client/ApiClient.java	34.49% <ø> (+1.86%)	41.00 <0.00> (+1.00)
...n/java/com/datadog/api/v2/client/ApiException.java	37.93% <ø> (+37.93%)	3.00 <0.00> (+3.00)
... and 234 more