Add IAsyncEnumerable support for Consumer

[rlgordey]

Please, add IAsyncEnumerable to list of Consume targets.

[timcassell]

I'm guessing you mean when returning IAsyncEnumerable(<T>) from the benchmark method, it should await foreach on the result and measure all the awaits and yields, and pass the T yielded values to Consumer.Consume()? Otherwise, this ask wouldn't make too much sense for just Consumer.Consume(IAsyncEnumerable).

[rlgordey]

I'm guessing you mean when returning IAsyncEnumerable(<T>) from the benchmark method, it should await foreach on the result and measure all the awaits and yields, and pass the T yielded values to Consumer.Consume()?

Yes @timcassell you are correct.

[timcassell]

In that case, this looks like a great candidate for a follow-up to my suggestion for fixing ValueTasks. #1595 (comment) Which is refactoring the engine to use an IMeasurer interface instead of System.Action WorkloadAction delegates.

[Edit] Note that this feature cannot be implemented without fixing ValueTasks, as the API relies on ValueTasks.

[timcassell]

For completeness, this should also include IAsyncEnumerator<T>.

[timcassell]

I can take this if #2111 gets merged.