Added SDK calls for createAzApp

[Vidya2606]

Description

Migrating the createAzApp funtion from Az CLI to Az SDK

Fixes # (issue)
Feature # (details)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration. Is it a breaking change which will impact consuming tool(s).

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[bfoley13]

I know we talked about creating an interface out of the ApplicationRequestBuilder so that we could mock the Post and other calls, are you still working through that or did you decide against it?

[Vidya2606]

I tried creating an interface, but the way is it used in other functions, I felt like it may not be a good idea. I can explain in more detail.

[Vidya2606]

The migration requires registration to Graph App which means the user had to do a device code login in the web browser which seemed to be a bad user experience, so we decided to keep the functions as is.