Add parseWithComments with correct span serialization

[elliots]

Why

Allows access to comments, and provides correct spans (so i can find what the comments are referring to)

How

Exposes the parseWithComments function, and uses tokenize_with_location

NOTE: claude did this. I'm using it, so it seemingly works ok, but just a heads-up.

[Copilot]

Pull request overview

This PR adds first-class support for extracting source comments (with spans/locations) alongside the parsed SQL AST, exposing the functionality through the TS API and WASM bindings.

Changes:

• Expose a new parseWithComments API (instance, static, and top-level) that returns { statements, comments }.
• Add TypeScript types for returned comments/spans and export them from the public types barrel.
• Update the Rust WASM layer to parse comments and to tokenize with location info; add js-sys to construct the JS return object.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/wasm.ts	Extends the WasmModule interface with parse_sql_with_comments.
src/types/index.ts	Re-exports the new comments types.
src/types/comments.ts	Adds SourceComment and ParseWithCommentsResult public types.
src/parser.ts	Adds parseWithComments APIs (instance/static/top-level) calling the new WASM export.
src/lib.rs	Adds parse_sql_with_comments WASM export; switches tokenization to include locations.
src/index.ts	Re-exports parseWithComments from the package entrypoint.
Cargo.toml	Adds js-sys dependency for JS object construction in WASM.
Cargo.lock	Locks js-sys addition.

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[guan404ming]

Hi @elliots thanks for your contribution. Could you help handle those review comments and also the pre-commit issue? I'm happy to merge this after that.

[elliots]

I believe, all fixed.

[guan404ming]

Thanks for the update