Add visitor support to WASM build via napi-wasm #373
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This adds support for visitors to the WASM build. Rather than reimplement this all again for wasm-bindgen and maintain two versions, I decided to shim the napi API for WASM so we can use the same implementation everywhere. That resulted in the napi-wasm project. This updates lightningcss to use it.
It also updates the playground to support custom visitors, and uses code mirror for a nicer editing experience.
Example