Async channel v2

[hymm]

Objective

• Update async channel to v2.

Solution

• async channel doesn't support send_blocking on wasm anymore. So don't compile the pipelined rendering plugin on wasm anymore.
• Replaces Update async-channel requirement from 1.4 to 2.1 #10405

Migration Guide

• The PipelinedRendering plugin is no longer exported on wasm. If you are including it in your wasm builds you should remove it.

#[cfg(all(not(target_arch = "wasm32"))]
app.add_plugins(bevy_render::pipelined_rendering::PipelinedRenderingPlugin);

[james7132]

Is there a reason why the entire module is hidden on wasm32? Otherwise we need to document this or this might be a sharp API edge.

[hymm]

The pipelined rendering plugin already doesn't work on wasm32. So I don't think removing it is a significant change. Though I agree that it should be documented.

[github-actions]

It looks like your PR is a breaking change, but you didn't provide a migration guide.

Could you add some context on what users should update when this change get released in a new version of Bevy?
It will be used to help writing the migration guide for the version. Putting it after a ## Migration Guide will help it get automatically picked up by our tooling.

[JMS55]

Btw should this not be just async-channel = "2"? And not 2.1 specifically.

[hymm]

Btw should this not be just async-channel = "2"? And not 2.1 specifically.

any reason not to specify 2.1.0 as minimum version? according to the changelog this bumps the future-lite version (smol-rs/async-channel#70) to match the one bevy now exports (#10670)

It was to match futures-lite versions.