Change log for FORTINET_FORTIAUTHENTICATOR

Date Changes
2025-05-06 - `SYSLOG` : Added support for `SYSLOG` Format.
- event.idm.read_only_udm.principal.hostname: Removed mapping of `prin_hostname` from `event.idm.read_only_udm.principal.hostname` UDM field.
- event.idm.read_only_udm.intermediary.hostname: Mapped `prin_hostname` raw log field with `event.idm.read_only_udm.intermediary.hostname` UDM field
2024-08-29 - Added support for the new format of KV logs.
2024-06-18 - Newly created parser.