Log exception.Data properties #754

Exceptions have a .Data property (https://docs.microsoft.com/en-us/dotnet/api/system.exception.data?view=netcore-2.1) that "gets a collection of key/value pairs that provide additional user-defined information about the exception."

It would be nice if these additional properties were logged. In https://github.com/Microsoft/ApplicationInsights-aspnetcore/blob/develop/src/Microsoft.ApplicationInsights.AspNetCore/Logging/Implementation/ApplicationInsightsLogger.cs, I see that the telemetry is populated with the stateProperties, but it would be good to also add the exception.Data to the telemetry.