Change log for SOPHOS_FIREWALL

Date	Changes
2022-12-01	Enhancement - Parsed logs for timezone="IST". - Mapped "application_category, application_risk and application_technology" to "security_result.detection_fields". - Mapped "fw_rule_name" to "security_result.rule_name". - Mapped "fw_rule_section" to "security_result.rule_set".
2022-08-18	Enhancement - Parsed logs for timezone="CEST". - Reduced Generic Event percentage - Mapped "user_name" to "event.idm.read_only_udm.principal.user.userid" - Mapped "device_id" to "event.idm.read_only_udm.principal.asset.asset_id"