Change log for PROOFPOINT_CASB

Date Changes
2025-03-20 Enhancement:
- Mapped "id" , "tenant_id" and "type" fields to "additional.fields".
- Mapped "sub_type" to "target.resource.resource_subtype".
- Mapped "severity" to "security_result.severity".
- Mapped "description" to "security_result.description".
- Mapped "title" to "metadata.description".
- Mapped "threat" to "security_result.threat_name".
- Mapped "sub_category" to "security_result.summary".
- Mapped "category" to "security_result.category_details".
- Mapped "classification id to "security_result.rule_id".
- Mapped "ip_address" to "principal.ip".
- Mapped "geo_location_latitude" to "principal.location.region_latitude".
- Mapped "geo_location_longitude" to "principal.location.region_longitude".
- Mapped "location" to "principal.location.name".
- Mapped "user_agent" to "network.http.user_agent".
- Mapped "full_name" to "principal.user.user_display_name".
- Mapped "user_email" to "principal.user.email_addresses".
- Mapped "user_id" to "principal.user.userid".
- Mapped "event_id" to "metadata.product_log_id".
- Mapped "cloud_services" to "target.application".
2025-03-14 Enhancement:
- Added support for new format of JSON logs.
2024-09-07 - Newly created parser.