refactor: update API endpoint paths and improve response handling

- Changed endpoint paths in DataController for better clarity and consistency:
  - Updated query endpoint from ':table/query' to 'query/:table'
  - Updated insert endpoint from ':table' to 'create/:table'
  - Updated update endpoint from ':table' to 'update/:table/:id'
  - Updated delete endpoint from ':table/:id' to 'del/:table/:id'
  - Updated advanceUpdate and advanceDelete endpoints to include table name in the body.

- Modified response handling in integration-test server to use spread operator with sanitize function for better response formatting.

- Added TODO comments in KyselyQueryHandler for unresolved issues with query handling.

Author: SOG-web