ADT UAI Update

[vilit1]

Continuation of Avin's work with UAI in Digital Twins:

New command group az dt identity to easily manage identities associated with the digital twin (without update):

• az dt identity assign
• az dt identity remove
• az dt identity show

Endpoints now have an identity params! Resource groups for endpoint resources are no longer necessary - if not present, the rg of the digital twin is used!

Dt create supports adding UAI's to the dt on create!

Note that DT does not support identity based auth for event grid endpoints.

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[vilit1]

regions that are not northeurope are broken so running all tests doesn't work for now.

[digimaun]

Merged, we'll plan for a follow up PR to cover any gaps.