Change log for SOPHOS_UTM

Date Changes
2022-04-13 Enhancement - Added mappings for following fields:
- 'categoryname' to 'security_result.category_details'.
- 'user' to 'target.user.userid'
- 'ad_domain' to 'target.administrative_domain'
- 'group' to 'target.group.group_display_name'
- 'sys' to 'metadata.product_event_type'
- 'application' to 'principal.application'
- 'auth' to 'extensions.auth.auth_details'
- 'profile' to 'security_result1.rule_name'
- 'app-id', 'reputation', 'request', 'authtime', 'dnstime', 'aptptime', 'cattime', 'avscantime' to 'additional.fields'