Change log for FORCEPOINT_WEBPROXY

Date Changes
2023-06-12 Enhancement:
- Modified Grok pattern to parse failing logs in which some of the values are present as '-'.
- Added condition check for field 'http_response' before mapping.
2022-08-11 Enhancement:
- Modified grok to parse CEF type logs with no syslog header.
2022-05-16 Enhancement: mapped category number to security_result.detection_fields.
2022-05-05 Enhancement:
dded mapping for fields:
requestClientApplication to http.user_agent.
proxyStatus-code to http.response_code.
disposition and cn1 to security_result.detection_fields.
Mapped 'cs2' field to 'security_result.category_details' if the value of 'cs2Label' is 'DynCat'.
Mapped 'cs2' field to 'security_result.detection_fields' if the value of 'cs2Label' is 'NatRuleId'.