BI-2922: Study Cache 5 - Update bi-api to utilize prodserver for filtering/sorting/pagination

[humsika]

Description

Story: BI-2922

This PR updates the ProdServer Studies search flow to support database-level filtering and sorting through the generic search query functionality.

The changes:

• Apply submitted filterBy parameters when building the Studies database query.
• Add supported filtering and sorting mappings.
• Correct the studyType mapping to use the studyType entity field instead of studyName.

This allows the Studies search endpoint to return only the filtered, sorted, and paginated records requested by the caller.

Dependencies

bi-web: feature/BI-2922
bi-api: feature/BI-2922
brapi-Java-ProdServer: feature/BI-2922

Testing

• Send a POST /brapi/v2/search/studies request with supported filterBy fields and verify that only matching Studies are returned.

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have commented my code, particularly in hard-to-understand areas
• I have either updated the source of truth or arranged for update with product owner if needed https://breedinginsight.atlassian.net/wiki/spaces/BI/pages/1559953409/Source+of+Truth