Change log for CISCO_SDWAN

Date Changes
2025-03-19 Enhancement:
- Added Grok patterns to parse the logs.
- Mapped "username1" to "target.user.userid".
- Mapped "security_result.action" to "ALLOW" or "BLOCK" based on the message.
- Mapped "metadata.event_type" to "USER_LOGIN" when the message contains "success" and "has_principal" and "has_user" are true.
- Mapped "metadata.event_type" to "USER_LOGOUT" when the message contains "LOGOUT" and "has_principal" and "has_user" are true.
2025-03-04 Enhancement:
- Mapped "timestamp" to "metadata.event_timestamp".
- Mapped "ip_1" to "principal.ip" and "principal.asset.ip".
- Mapped "ip_2" to "target.ip" and "target.asset.ip".
- Mapped "port_1" to "principal.port".
- Mapped "port_2" to "target.port"
- Mapped "system_ip" to "principal.ip" and "principal.asset.ip".
- Mapped "instance_id" to "target.resource.product_object_id".
- Mapped "message_1" to "metadata.description".
- Mapped "network_protocol" to "network.ip_protocol".
- Mapped "hostname" to "principal.hostname".
- Mapped "classification" to "security_result.category_details".
- Mapped "priority" to "security_result.severity".
- Mapped "policy" to "security_result.detection_fields".
- Mapped "malware" to "security_result.detection_fields".
- Mapped "filename" to "target.file.names".
- Mapped "filetype" to "target.process.file.mime_type".
2025-02-24 - Added support to parse the unparsed logs.
2025-01-16 - Newly created parser.