[Experiment][Compute] Tab completion for New-AzVm

[sergey-shandar]

Description

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[sergey-shandar]

#4632

[sergey-shandar]

#4647

[maddieclayton]

I don't understand what most of the changes are doing, but the Register-ArgumentCompleter code looks good to me.

[markcowl]

@sergey-shandar did not get a chance to update the preview branch with this, will review on return.

[markcowl]

I think we should pair this with some validations, like validating the output of the cmdlet, and perhaps performing a Get and verifying proeprties for the expected resources.

[markcowl]

Compute = 3.4.0, Network = 4.4.0, Resources = 4.4.0