[Tracking] Review current module mapping

[peombwa]

We should review the current module mapping to ensure we cover all APIs.

Taks to completed as part of this effort:

• [ ] Review and explore an alternative module mapping that's more compact e.g., https://docs.microsoft.com/en-us/answers/products/graph.
• [x] Add Multi-tenant management APIs under tenantRelationships singleton.
• [ ] Fix https://github.com/microsoftgraph/msgraph-sdk-powershell/issues/946
• [ ] Fix https://github.com/microsoftgraph/msgraph-sdk-powershell/issues/842
• [ ] Fix https://github.com/microsoftgraph/msgraph-sdk-powershell/issues/911
• [ ] Fix https://github.com/microsoftgraph/msgraph-sdk-powershell/issues/867