Add retrieve audit settings to the table definition Web API

The "IsRetrieveAuditEnabled" and "IsRetrieveMultipleAuditEnabled" settings are missing from the entity metadata returned by the Web API. https://docs.microsoft.com/en-us/dynamics365/customer-engagement/web-api/entitymetadata?view=dynamics-ce-odata-9 Adding support for these, even as read only attributes would be helpful. We need to be able to run configuration monitoring against our environments to ensure that audit/compliance settings are consistent and correct across environments. The lack of support the above two audit settings limits our ability to effectively maintain compliance.