Proposal: WASI WIT artifacts should include unstable features

[ricochet]

We have been releasing WASI artifacts with: wkg wit build --wit-dir .. By default, this does not include unstable features.

Proposal is to change the artifact that we release as part of our train model to include unstable features. The annotations for unstable will be retained so downstream parsers may select for only stable features or opt-in to the set of unstable features.

For additional context: bytecodealliance/wasm-pkg-tools#144

Past presentations walking through the process:

• https://github.com/WebAssembly/meetings/blob/main/wasi/2024/presentations/2024-05-30-yosh-wuyts-leveraging-since-unstable-gates-in-wasi.pdf
• https://github.com/WebAssembly/meetings/blob/main/wasi/2024/presentations/2024-06-13-yosh-wuyts-progressing-proposal-changes-through-the-phase-process.pdf

[lann]

This appears to be done with 0.2.4?