Change log for CISCO_FIRESIGHT

Date Changes
2023-09-21 Enhancement:
- Mapped "proto_type" to "network.ip_protocol".
- Added validation checks before mapping "entry.agent.type".
- Removed repetitive code for "recordTypeCategory" and mapped "recordTypeCategory to "metadata.product_event_type".
- Mapped "severity_code to "security_result.severity".
- Mapped "service_type", "syslog_facility_code", "syslog_priority" to "additional.fields".
- Mapped "entry_msg" to "metadata.description".
2022-10-01 Enhancement:
- Migrated customer specific to default parser.