Add `BaseGroup.get_audit_log`

[Jodenee]

Is your feature request related to a problem? Please describe. There is no built in function to get a groups audit log.

If your feature is related to implementing a new Roblox API, provide information here. API URL: /v1/groups/{groupId}/audit-log Documented: Yes

Describe the solution you'd like A new method should be added to BaseGroup named get_audit_log that should return an iterator of AuditLogItems