Add Windows Web Account Manager (WAM) Brokered Authentication Support

[joshfree]

This is a tracking work item for creating/finishing the new Azure.Identity.BrokeredAuthentication client library (separate package from the existing Azure Identity client library).

Related:

• https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity.BrokeredAuthentication/README.md

Dependencies:

• MSAL WAM is supported (Beta) in .NET and Python today
• MSAL WAM support (Beta) for Java and Javascript is not yet available but is expected to be available in time for this scheduled development milestone.

[joshfree]

Link to dependency AzureAD/microsoft-authentication-library-for-python#451