Change log for CYBERARK_PAM

Date Changes
2025-02-06 Enhancement:
- Mapped "signature_id" to "metadata.product_event_type".
- If "severity" is 0, 1, 2, or 3, then "security_result.severity" is mapped to "LOW". Otherwise, if "severity" is 4, 5, or 6, then "security_result.severity" is mapped to "MEDIUM". Otherwise, if "severity" is 7 or 8, then "security_result.severity" is mapped to "HIGH". Otherwise, if "severity" is 9 or 10, then "security_result.severity' is mapped to "CRITICAL".
2024-11-28 Enhancement:
- Added a Grok pattern to parse "metadata.version".
2024-11-21 Enhancement:
- Mapped "act" to "metadata.product_event_type".
- Mapped "app" to "target.application".
2024-10-29 - Added support for new log patterns.
2024-05-05 - Newly created parser.