timezone conversion support for Rest-API

[rkrenn]

so far, the implementation uses the UserTimezone setting in the JSF UI layer only:

• the database contains values in application timezone (eg. UTC)
• forward: datetime values are converted into UserTImezone when dispalying it in the UI
• backward: entered values are converted back from UserTimezon into application timezone

so the proper solution here is to complete the implementation:

• implement the forward timezone conversion also in the PDF renderers
• implement the forward timezone conversion also in the Excel renderers
• implement the forward timezone conversion also for the rest-api response objects (to have it in the exports as desired)

this change addresses point 3 above, the timezone conversion when using the Rest-API, eg. for eCRF data exports.

the timezone conversion can be enabled by providing the optional "?tz=" query parameter in the request URLs, eg. "?tz=America/Chicago":

• date fields of Json request bodies will be read as America/Chicago time, and converted to the application timezone when persisting the value in the database.
• date fields of Json response objects will be printed in America/Chicago time

For eCRF/Inquiry/SubjectListAttribute input, the the timezone conversion can be controlled by the inputfield's "User Timezone" flag (the above conversion is done only if ticked).

finally also UIdatatable&rest-api items filtering is improved:

• apply timezone also to filter values
• support filtering for datetime values (more narrow than just from start-of-day till end-of-day)
• support filtering for encrypted date values (eg. subject DoB)

[sonarqubecloud]

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