Change log for FORTINET_FORTIMAIL

Date Changes
2026-05-27 Enhancement:
- Added new grok pattern to parse the raw logs.
- event.idm.read_only_udm.target.url: Newly mapped url raw log field with event.idm.read_only_udm.target.url UDM field.
- event.idm.read_only_udm.additional.fields: Newly mapped syslog_priority raw log field with `event.idm.read_only_udm.additional.fields UDM field.
2025-02-25 Enhancement:
- Mapped type and subtype to metadata.product_event_type.
- Mapped to to network.email.to.
2023-09-06 Enhancement:
- Added a Grok pattern to extract the data and parse failing KV logs.
2023-05-23 - New parser.