feat(transform): oxc_traverse crate

[overlookmotel]

First part of #3152.

This adds a crate oxc_traverse, but doesn't connect it up to the transformer or anything else yet.

I think we could merge this now - as it doesn't affect any code that's in use - and then iterate on it to add scopes before using it in transformer. Please see #3152 (comment) for the broader picture.

[codspeed-hq]

CodSpeed Performance Report

Merging #3169 will not alter performance

_{Comparing 05-05-feat_transform_oxc_traverse_crate (059d886) with main (f88f330)}

Summary

✅ 30 untouched benchmarks

[mysteryven]

These documents explain things really really good! I should read your PRs one by one, they are all treasures.

[overlookmotel]

That's incredibly kind of you to say. Thank you.

I do think it's important to write lengthy comments to explain how things work. But I'm a native English speaker, so I have an advantage in that respect - it's quite easy for me to turn thoughts into English words.

If you find anything where the comments don't make sense, or don't fully explain what the code is doing, or why, please do alert me and I'll do my best to improve them.