Flush the TelemetryChannel when the logger provider is disposed #1289
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Automatically flush the telemetry channel when the ApplicationInsightsLoggerProvider is disposed.
This usually happens when the application calls Dispose on the ServiceProvider -- it calls Dispose on all IDisposable services that were instantiated.
This helps with Console applications that use ILogger which otherwise lose events sent just before shutdown. This works well for the InMemoryChannel but there is a long-standing issue with the ServerTelemetryChannel where Flush doesn't guarantee that all events have been transmitted. There's a TODO in the code about that.