Azure authentication

[ma-armenta]

Why are these changes needed?

This is a sample of how azure authentication can be implemented. Leveraging azure authentication flow and app registration with roles. It also enables multi-tenant functionality by grouping objects by role/group.

Related issue number

resolves #2733

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[gitguardian]

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[ekzhu]

Thanks for the PR! It looks huge. Will take some time after discussion with @victordibia okay?

[ma-armenta]

Thanks for the PR! It looks huge. Will take some time after discussion with @victordibia okay?

Sounds good, thank you! I had talk to @victordibia about this some time back. Looking forward to your feedback.