[ACR] Auto Build Swagger: Add registry identity properties to response

[xiadu94]

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[azuresdkci]

Can one of the admins verify this patch?

[dsgouda]

@sergey-shandar I and @praries880 can take over this one

[dsgouda]

@praries880 take a look and let me know if you have any queries

[praries880]

@xiadu94

• This new type is not referenced anywhere else in the model.. what is its purpose?
  • If this is indeed an object created at the server side and returned to the user, you should mark the properties as readonly. example here
• Is this meant to be returned from the server side or is it a config object that the user will create?