Managed log source for GCP Cloud Audit Logs

[Samrose-Ahmed]

GCP provides Cloud Audit Logs similar to CloudTrail, we should provide a managed log source for this.

Reference

• https://cloud.google.com/logging/docs/audit
• https://cloud.google.com/logging/docs/reference/audit/auditlog/rest/Shared.Types/AuditLog#ServiceAccountDelegationInfo