Ratify should provide a generic Azure authentication package

[shahramk64]

Ratify should support a more generic AAD auth token fetch functionality that can handle managed identity, workload identity, and CLI scenario authentications. Along with this, the AKV provider and ORAS auth provider should provide more generic azure support to handle multiple flows of authentication, not just Workload identity. This is critical for CLI scenarios.

Are you willing to submit PRs to contribute to this feature?
Yes, I am willing to implement it.