Change log for HAPROXY

Date Changes
2023-09-25 Enhancement:
- Added new Grok patterns to parse new type of logs.
- Mapped "http_version" to "metadata.product_version".
- Mapped "user_name" to "target.user.userid".
- Mapped "process_name" to "target.application".
- Mapped "severity" to "security_result.severity".
- Mapped "msg" to "security_result.summary".
- Added new conditions for new log types and their severity.
2023-05-08 - Added new Grok pattern to parse new type of logs.
2022-10-20 Newly created parser.