Change log for FORTINET_FORTICLIENT

Date Changes
2023-12-29 Enhancement:
- Changed mapping of "SubjectUserName" from "principal.user.userid" to "additional.fields".
- Changed mapping of "uid" from "principal.user.userid" to "principal.user.product_object_id".
- If "uid" is not present, mapped "fctuid" to "principal.user.product_object_id".
- Mapped "user" to "principal.user.userid" on the top of its mapping to "principal.user.user_display_name".
2023-11-30 Enhancement:
- Added a Grok pattern to parse the new logType.
- Added a Grok pattern to parse the new XML part.
- If "devname" is not null, set "principal.resource.type" to "DEVICE".
- Mapped "devname" to "principal.resource.name".
- Mapped "itime" to "additional.fields".
- Mapped "fctsn" to "additional.fields".
- Mapped "logver" to "additional.fields".
- Mapped "id" to "metadata.product_log_id".
- Mapped "subtype" to "principal.resource.resource_subtype".
- Mapped "eventtype" to "metadata.product_event_type".
- Mapped "level" to "security_result.severity".
- Mapped "pcdomain" to "principal.administrative_domain".
- Mapped "site" "additional.fields".
- Mapped "fctver" "additional.fields".
- Mapped "sessionid" to "network.session_id".
- Mapped "srcname" to "principal.resource.attribute.labels".
- Mapped "srcproduct" to "principal.application".
- Mapped "srcport" "principal.port".
- Mapped "direction" to "network.direction".
- Mapped "dstip" to "target.ip".
- Mapped "remotename" to "target.hostname".
- Mapped "dstport" to "target.port".
- Mapped "proto" to "network.ip_protocol"
- Mapped "rcvdbyte" to "network.received_bytes".
- Mapped "sentbyte" to "network.sent_bytes".
- Mapped "utmaction" to "security_result.description".
- Mapped "sec_action" to "security_result.action".
- Mapped "utmevent" to "security_result.category_details".
- Mapped "threat" to "security_result.threat_name".
- Mapped "service" to "network.application_protocol".
- Mapped "url" to "principal.url".
- Mapped "userinitiated" to "security_result.detection_fields".
- Mapped "browsetime" to "additional.fields".
- Mapped "date" and time" to "metadata.event_timestamp".
- Mapped "timestamp" to "metadata.collected_timestamp".
- Mapped "client_ip" to "principal.ip".
- Mapped "source_ver" to "principal.platform_version".
- Mapped "source_type" to "principal.resource.attribute.labels".
- Mapped "type" to "principal.resource.attribute.labels".
- Mapped "event_id" to "additional.fields".
- Mapped "ThreadID" to "additional.fields".
- Mapped "SubjectLogonId" to "additional.fields".
- Mapped "fctuid" to "principal.user.product_object_id".
- Mapped "source_ver" to "principal.platform_version".
- Mapped "ProviderGuid" to "principal.resource.product_object_id".
- Mapped "ProcessId" to "principal.process.pid".
- Mapped "SubjectUserSid" to "principal.user.windows_sid".
- Mapped "SubjectUserName" to "principal.user.userid".
2023-10-27 - Newly created parser.