Support for AAD Audience in connection string (for sovereign cloud)

[harsimar]

Fix # .
Note: Don't merge until this related change from the autoconfigure module is released.

This PR incorporates connection string parsing changes from the autoconfigure module to use the AAD audience that is either provided via the connection string (or a default audience if that isn't provided). This is applicable for sovereign cloud scenarios where customers may be using AAD auth - the LazyHttpClient would use the provided audience when creating a new http pipeline, and all calls to quickpulse/breeze/profiler would be made with that audience.

Need to test in sovereign cloud environment.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed
• CHANGELOG.md updated