Generated async methods do not correctly propagate OperationCanceledException

[EamonHetherton]

a number of the generated async methods will swallow OperationCanceledException and cause the resulting tasks to transition to the Faulted state instead of the Cancelled state when cancelling queries.

I have raised an issue over at maca88/AsyncGenerator#90 but in the meantime I believe a solution is to add catch (OperationCanceledException) { throw; } ahead of catch (Exception) where the catch block is catching an ancestor type of OperationCanceledException

[EamonHetherton]

AsyncGenerator has now been fixed so this should be resolved by updating CSharpAsyncGenerator.CommandLine to v 0.11.0