[MTP v2] Add CancellationToken parameter to more async methods. #5342
Description
The one I see for now is IOutputDevice.DisplayAsync. I think it's worth having CancellationToken parameter there as a breaking change in v2.
Then, internally, IServerTestHost.PushDataAsync will have cancellation token parameter as well which will be used in concrete implementation ServerTestHost.PushDataAsync instead of the concrete implementation retrieving ITestApplicationCancellationTokenSource from service provider.