Azure.Identity logging level should control the underlying log level of MSAL.NET

[christothes]

Currently, MSAL logging is enabled with the default arguments via the .WithLogging APIs

azure-sdk-for-net/sdk/identity/Azure.Identity/src/MsalConfidentialClient.cs

Line 76 in b9b9d42

.WithLogging(LogMsal, enablePiiLogging: IsSupportLoggingEnabled);

azure-sdk-for-net/sdk/identity/Azure.Identity/src/MsalPublicClient.cs

Line 49 in b9b9d42

.WithLogging(LogMsal, enablePiiLogging: IsSupportLoggingEnabled);

This default configuration always results in an MSAL log level of Informational. However, there are some troubleshooting scenarios in which Verbose level logging is desirable.

MSAL logging should be dynamically configurable via the current enabled logging level used by the Identity EventSource. To do this, we must implement the IIdentityLogger interface and pass that to the .WithLogging api.