Expose an AsyncReadOnlySource

[rhgndf]

HlsStream already wraps any struct with the AsyncRead trait into an AsyncMediaSource, so rename it to AsyncReadOnlySource and expose it in the crate. This is very similar to the sync version symphonia_core::io::ReadOnlySource.

A possible use case would be streaming PCM samples to a discord voice channel:

let (audio_receiver, mut audio_sender) = tokio::io::simplex(76800);
let audio_stream = AsyncAdapterStream::new(
    Box::new(AsyncReadOnlySource::new(audio_receiver)),
    76800,
);
let adapter = RawAdapter::new(audio_stream, 48000, 2);
let _ = handler.play_input(adapter.into());

Unfortunately, doing cargo make ready results in a lot of errors and I am not familiar enough with the codebase to add docs or fix them. However, since this is mostly shuffling around existing code, there shouldn't be any additional errors.

[FelixMcFelix]

At first glance this looks reasonable enough to me; thanks for putting it together. AsyncReadOnlySource is a useful utility to expose.

One minor nit/question. Otherwise, I would ignore the CI failure on missing documentation. Those are benchmark-harness specific methods which should be marked s.t. the missing_docs lint skips them. I'm not sure what's changed in nightly to cause this, but I'll tackle that shortly.

[FelixMcFelix]

Can I ask why you've done this? async-simd is still supported as of 0.4.x.

[rhgndf]

This makes some tests run when rebased on top of serenity-next. Probably due to this commit:

05cf36b#diff-9375fd04332c86472d7be397ef09428cb86babd8826880a5835bd1d1c1bdbc08L11

I have removed the commit.

[FelixMcFelix]

Yeah, the support is removed from next but still present here. Thanks for fixing that up.

[FelixMcFelix]

Looks good to me, thanks; happy that this is non-breaking since most of the HlsStream internals are private. Feel free to merge when you're ready!

EDIT: D'oh, I'll pull it in.