Change log for OCI_AUDIT

Date Changes
2024-06-14 Enhancement:
- If "has_principal_user", "has_target_user", or "has_target" is "true", then set "metadata.event_type" to "USER_UNCATEGORIZED".
2023-09-29 Bug-Fix:
- Added a Grok pattern before mapping "data.identity.ipAddress" to UDM fields.
- Mapped "ip1" to "principal.ip".
- Mapped "ip2" to "principal.ip".
2023-05-23 Newly created parser.