Change log for ORACLE_DB

Date	Changes
2022-10-13	Enhancement: - Added grok pattern to handle SYSLOG and KV logs.
2022-08-01	Enhancement: Added mapping for following fields: - "hostname" mapped to "principal.hostname". - if "returncode" is "0" then security_result.action mapped to "ALLOW" else if it is "-1" then mapped to "BLOCK" - "ACTION" mapped to "metadata.product_event_type". - "DATABASE USER" mapped to "principal.user.user_display_name". - "PRIVILEGE" mapped to "principal.user.attribute.permissions". - "CLIENT USER" mapped to "target.user.user_display_name". - "file_name" mapped to "target.file.full_path". - "event_name" mapped to "metadata.product_event_type". - "ACTION_NUMBER" mapped to "event.idm.read_only_udm.additional.fields". - "length" mapped to "event.idm.read_only_udm.additional.fields". - "DBID" mapped to "metadata.product_log_id".