Change log for FORTINET_DHCP

Date Changes
2022-11-21 Enhancement:
- Mapped the field "srcip" to "principal.ip".
- Mapped the field "srcport" to "principal.port".
- Mapped the field "srccountry" to "principal.location.country_or_region".
- Mapped the field "interface" to "principal.hostname".
- Mapped the field "user_name" to "principal.user.user_display_name".
- Mapped the field "srcuuid" to "principal.user.product_object_id".
- Mapped the field "host_name" to "intermediary.hostname".
- Mapped the field "dstip" to "target.ip".
- Mapped the field "dstport" to "target.port".
- Mapped the field "dstcountry" to "target.location.country_or_region".
- Mapped the field "application" to "target.application".
- Mapped the field "dstuuid" to "target.user.product_object_id".
- Mapped the field "url" to "target.url".
- Mapped the field "profile" to "target.resource.name".
- Mapped the field "sessionid" to "network.session_id".
- Mapped the field "direction" to "network.direction".
- Mapped the field "proto" to "network.ip_protocol".
- Mapped the field "duration" to "network.session_duration.seconds".
- Mapped the field "sentbyte" to "network.sent_bytes".
- Mapped the field "rcvdbyte" to "network.received_bytes".
- Mapped the field "level" to "security_result.severity_details".
- Mapped the field "policyid" to "security_result.rule_id".
- Mapped the field "policyname" to "security_result.rule_name".
- Mapped the field "policytype" to "security_result.rule_type".
- Mapped the field "catdesc" to "security_result.category_details".
- Mapped the field "crlevel" to "security_result.severity".
- Mapped the field "crscore" to "security_result.severity_details".
- Mapped the field "srcintf", "srcintfrole", "dstintf", "dstintfrole" and "craction" to "security_result.detection_fields".
- Mapped the field "sentpkt", "rcvdpkt" and "appcat" to "additional.fields".
- Mapped the field "action" to "security_result.action" and "security_result.action_details".