Change log for FORTINET_FORTIANALYZER

Date Changes
2025-04-20 Enhancement:
- `SYSLOG`: Added support for `SYSLOG` format.
- Modified gsub pattern in order to parse the logs with `SYSLOG` Format
2025-04-02 Enhancement:
- event.idm.read_only_udm.network.http.user_agent,event.idm.read_only_udm.network.http.parsed_user_agent:Newly mapped `agent` raw log field with `event.idm.read_only_udm.network.http.user_agent` and `event.idm.read_only_udm.network.http.parsed_user_agent` UDM field.
2025-02-27 Enhancement:
- Mapped "dstname" to "target.hostname" and "target.asset.hostname".
2025-01-31 Enhancement:
- Mapped "catdesc" to "security_result.rule_name".
- Mapped "crscore" to "security_result.detection_fields".
- Mapped "method" to "network.http.method".
- Mapped "cat" to "security_result.rule_id".
2025-01-02 Enhancement:
- When "action" is "login" and "status" is "success", then mapped "ALLOW" to "security_result.action".
- When "action" is "login" and "status" is "failure", then mapped "BLOCK" to "security_result.action".
2024-11-28 Enhancement:
- Mapped "filename" to "target.file.full_path".
2024-11-19 Enhancement:
- Mapped "dstuser" to "target.user.userid".
2024-11-13 Enhancement:
- Mapped "fsaverdict" to "additional.fields".
2024-10-28 Enhancement:
- Changed "srcinf", "dstinf", "srcintfrole", and "dstintfrole" mapping from "security_result.detection_fields" to "additional.fields".
2024-10-16 Enhancement:
- Mapped "type", "subtype", and "level" to "metadata.ingestion_labels".
2024-10-01 Enhancement:
- Mapped "logdesc" to "metadata.description".
2024-10-01 Enhancement:
- Mapped "logdesc" to "metadata.description".
2024-09-23 Enhancement:
- Modified mapping for "devname" to "principal.resource.attribute.labels".
- Mapped "srcname" to "principal.hostname" and "principal.asset.hostname".
2024-09-12 Enhancement:
- Added conditional checks to map the value "BLOCK" to the "security_result.action" UDM field when the "reason" value is "sslvpn_login_permission_denied".
2024-07-22 Enhancement:
- Added "gusb" to handle the unparsed logs.
2024-07-04 Enhancement:
- When "msg" contains "login", then set "event_type" to "USER_LOGIN".
2024-04-25 Enhancement:
- Mapped "httpmethod" to "network.http.method".
- When "action" is "login", then map "ALLOW" to "security_result.action".
- When "msg" contains "logged in successfully", then set "event_type" to "USER_LOGIN".
- When "msg" contains "login failed", then set "event_type" to "USER_LOGOUT".
2023-07-19 Bug-Fix:
- Added gsub to remove "\n" to parse failing logs.
2023-05-05 - Added support for logs with CEF format.
2022-09-19 Newly Created Parser