feat(ast-grep): Add experimental ast-grep Wasm plugin

[kdy1]

I'm trying to see if we can support ast-grep using a Wasm plugin so a user can modify AST using ast-grep, instead of building a plugin

[changeset-bot]

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[kdy1]

cc @HerringtonDarkholme for visibility

[HerringtonDarkholme]

Hi Donny!

For some background, ast-grep now is relying on tree-sitter as the parser. So using it with SWC will have to include another parser. Also, the tree-sitter cannot be compiled as WASM using Rust. It has to be compiled with emscripten.

However, if ast-grep can be changed to be parser independent, say, providing a trait for AST node/Parser, it is possible to compile it with SWC to a standalone WASM.

It will take quite a lot of effort, but it is not impossible! I can do some experiments in the coming weekend and give you a rough estimate of how much time it will take.