Change log for BEYONDTRUST_BEYONDINSIGHT

Date Changes
2025-07-23 Enhancement:
- Added gsubs to ensure proper mapping of KV format logs.
- Modified a gsub to ensure proper mapping of `OS` and `Agent Version` raw log fields.
- event.idm.read_only_udm.additional.fields: Newly mapped `EventType` raw log field to `event.idm.read_only_udm.additional.fields` (with key `Event Type`).
- Added a grok pattern to check if `souirceip` is a valid IP address before mapping it to `event.idm.read_only_udm.principal.ip` UDM field.
2025-05-13 Enhancement:
- Added support to handle the '#' character in the UDM Fields.
- Added support for the parsing the metadata.event_type.
- Added support required null checks while doing the mapping.
2025-04-21 Enhancement:
- Added a grok pattern to support new format of SYSLOG logs.
- Added gsub to fix the kv parsing issue.
2025-02-06 Enhancement:
- Added support to map the unparsed fields.
2024-11-22 - Newly created parser.