Change log for BARRACUDA_FIREWALL

Date Changes
2024-09-05 Enhancement:
- Modified a Grok pattern to handle unparsed logs.
2024-05-17 Enhancement:
- Added "on_error" for a Grok filter.
- Added IP address check for "target_ip" before merging with "target.ip".
2024-04-12 Enhancement:
- Modified date pattern to consider "event_time" value that includes timezone.
2024-03-22 Enhancement:
- Added new Grok to parse logs with timestamp of ISO8601 format.
2022-07-08 Newly Created Parser.