Proposal: Introduce AzureConfigurationOptions to wrap Parse/ConfigureForAzureWith...

This is suggestion to hold more information in the connection string so that a new class `AzureConfigurationOptions` could extract which overload of `ConfigureForAzureWith...` automatically based on the values provided.

This then makes it a configuration rather than a code change when changing between manged identity, user identity etc.

I know `new DefaultAzureCredential()` does some of that, but this allows it to easily vary on a per connection basis.