Change log for CA_SSO_WEB

Date Changes
2022-08-08 Enhancement -
- Added the header.
- Added conditional check and grok pattern for the field 'ClientIp' mapped to 'principal.ip'.
- Added conditional checks for the fields :
- 'Action' mapped to 'network.http.method'.
- 'AgentName' mapped to 'target.hostname'.
- 'sm_user' mapped to 'target.user.email_addresses'
- 'sm_group' mapped to 'target.user.group_identifiers'.