Rust-based WASM HTML parser

[tbranyen]

This introduces an alternative HTML parser written in Rust. Currently this is using a third party library called tl and wasm-bindgen to convert from Rust structures into JavaScript using WASM.

• Get CI builds and tests working
• Start migrating more responsibilities into the tagged template vs in the parser
• Get integration working with diffhtml core
• Write documentation and test babel integration
• Try and reuse more html tests
• Get filesize down further and improve performance
• Add documentation for webpack, esbuild, and vite

[tbranyen]

Just added a webpack example using the WASM parser at runtime for development and in Babel for compile-time consistency. The production bundle gets as low as 7Kb with gzip!

[tbranyen]

I'm going to merge since there are updates here I want to use to influence the new JS HTML parser PR (such as removing all the fragment flattening and dynamic interpolation).