Support WASI preview 2

[Darksonn]

Preview 2 is the official next evolution of Wasi and has been officially adopted by the Wasi Subgroup which is an official subgroup of the WebAssembly Community Group of the W3C.

Currently, we only support WASI preview 1. We should upgrade our unstable WASI support to support preview 2.

This issue is concerned with supporting preview 2 under --cfg tokio_unstable. Supporting WASI without the --cfg tokio_unstable flag is a separate question and tracked by #4827.

[banocean]

Looks like we should be looking for bytecodealliance/wasi-rs#72, everything suggests it's gonna be first thing allowing us to work on preview 2

[banocean]

https://blog.rust-lang.org/2024/04/09/updates-to-rusts-wasi-targets.html 🎉