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.