Change log for VANDYKE_SFTP

Date Changes
2025-05-15 Enhancement:
- event.idm.read_only_udm.metadata.event_type: Removed mapping of STATUS_UPDATE from event.idm.read_only_udm.metadata.event_type UDM field and mapped to USER_LOGIN if it is a login event.
- event.idm.read_only_udm.metadata.event_type: Removed mapping of STATUS_UPDATE from event.idm.read_only_udm.metadata.event_type UDM field and mapped to USER_LOGOUT if it is a logout event.
- Added Grok patterns to support new pattern of logs.
- event.idm.read_only_udm.principal.user.userid: Removed mapping of user_id from event.idm.read_only_udm.principal.user.userid UDM field.
- event.idm.read_only_udm.target.user.userid: Newly mapped username raw log field with event.idm.read_only_udm.target.user.userid UDM field.
- event.idm.read_only_udm.principal.user.user_display_name: Removed mapping of username from event.idm.read_only_udm.principal.user.user_display_name UDM field.
- event.idm.read_only_udm.target.user.user_display_name: Mapped username raw log field with event.idm.read_only_udm.target.user.user_display_name UDM field.
- event.idm.read_only_udm.security_result.action: Newly mapped ALLOW with event.idm.read_only_udm.security_result.action if it is a successful login event.
- event.idm.read_only_udm.security_result.action: Newly mapped BLOCK with event.idm.read_only_udm.security_result.action if it is a failed login event.
- event.idm.read_only_udm.additional.fields: Newly mapped id raw log field with event.idm.read_only_udm.additional.fields UDM field.
2025-05-13 Enhancement:
- Added gsub filters to remove carriage returns (\r\n) and newlines (\n) from the message field.
- Modified the grok pattern for the port field from %{DATA:port} to %{INT:port} to ensure the port is parsed as an integer.
2025-03-13 Enhancement:
- Added a Grok pattern to extract prinicipal.user.userid.
- Mapped reason to security_result.summary.
- Mapped srcip to principal.ip and principal.asset.ip.
- Mapped username to principal.user.user_display_name.
2025-02-11 Enhancement:
- Added a Grok pattern for new syslog format.
2022-03-25 - Newly created parser.
- Supports JSON + SYSLOG format.