Try to supports WASI targets.

[langyo]

I've been trying to use yew to render the page into the static HTML string on WASI. However, stylist cannot distinguish the browser WASM target (wasm32-unknown-unknown with wasm-bindgen) and WASI target (wasm32-wasi), and it would choose wrong modules for wasm32-*.

I have fixed it by using target_os, and it would fix the problem.

[langyo]

I see that your Github homepage has no contribution records for a long time... Do you have time to review this branch merge request?
@futursolo

[langyo]

I added a new feature called not_browser_env to this patch to support non-browser, non-WASI-compliant WASM targets, such as NodeJS WASM runtime or Cloudflare Workers. I hope you can take the time to review and publish the additional feature I provided.

@futursolo