WIP[feat(runtime): Add support for wasm32-wasip3 compilation target.]

[Aditya1404Sal]

Does your PR solve an issue?

closes #4056

Is this a breaking change?

No, New runtime would run separately, conditional compilation ensures that.

[abonander]

You're welcome to continue experimenting with this, but there's no point in merging this until it's stabilized as a target for rustc itself. We don't have the bandwidth to maintain support for an experimental target.

[Aditya1404Sal]

You're welcome to continue experimenting with this, but there's no point in merging this until it's stabilized as a target for rustc itself. We don't have the bandwidth to maintain support for an experimental target.

Totally fair, I understand it’s still experimental. The WASI Preview 3 target (wasm32-wasip3) is expected to land in the next Rust release or just after that (most probably), but for now I’m using wasm32-wasip2 as the dev target to keep things working.

It’s mostly exploratory right now, but it does feel like something that’ll be quite useful once stabilized.

[Aditya1404Sal]

@abonander Would it be alright to keep this PR open as a reference while I continue experimenting, or would you prefer I link to my fork in the relevant issue and close this PR to keep the list clean?