Change log for CS_FILEVANTAGE

Date Changes
2025-04-16 - `event.idm.read_only_udm.security_result.severity`: Newly mapped `severity` raw log field with `event.idm.read_only_udm.security_result.severity` UDM field and added condition checks.
- If `severity` raw log field is in `ERROR`, `CRITICAL` then mapped `event.idm.read_only_udm.security_result.severity` to `CRITICAL`.
- If `severity` raw log field is in `MAJOR`, `HIGH`, `MAJOR` then mapped `event.idm.read_only_udm.security_result.severity` to `HIGH`.
- If `severity` raw log field is in `WARNING` then mapped` event.idm.read_only_udm.security_result.severity` to `MEDIUM`.
- If `severity` raw log field is in `MINOR`,`LOW` then mapped `event.idm.read_only_udm.security_result.severity` to `LOW`.
- If `severity` raw log field is in `INFO` then mapped `event.idm.read_only_udm.security_result.severity` to `INFORMATIONAL`.
2024-11-26 Newly created parser.