Change log for ARRAYNETWORKS_VPN

Date Changes
2026-08-11 Enhancement:
- Added support to parse new date format for timestamp field.
- event.idm.read_only_udm.network.session_id: Newly mapped sessionid raw log field with event.idm.read_only_udm.network.session_id UDM field.
- event.idm.read_only_udm.intermediary.hostname: Newly mapped fw raw log field with event.idm.read_only_udm.intermediary.hostname UDM field.
- event.idm.read_only_udm.additional.fields: Newly mapped last_action_time, current_time, idletime, session_id, duration, hardwareid, aaa_method, aaa_role and timezone_offset raw log fields with event.idm.read_only_udm.additional.fields UDM field.
2024-05-14 Enhancement:
- Added support for a new format of log.
2024-05-07 New:
- Newly created parser.