ci(github): add pull request size labels

[binbandit]

Summary

• add a PR size workflow that labels pull requests from additions plus deletions
• make vouch label updates remove and add only managed labels to avoid label clobbering
• document the new size labels for contributors

Testing

• bun fmt
• bun lint
• bun typecheck

Note

Add pull request size labels via GitHub Actions workflow

• Adds pr-size.yml, a new workflow that runs on pull_request_target and applies a single size:* label (XS through XXL) based on total changed lines, removing any conflicting size labels automatically.
• Updates pr-vouch.yml to use a Set for managed label lookups, fetch up to 100 labels, ignore 422 errors on label creation, and remove only conflicting vouch labels instead of resetting all labels.
• Updates CONTRIBUTING.md to document the new size labeling behavior.

^{Macroscope summarized 552a142.}

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[binbandit]

@juliusmarminge This will help us easily workout the quick-win PR's vs the ones that can wait till we have a coffee and some spare time 😂

[Bashamega]

Maybe add to the docs which PR size will likely get accepted, or reviewed faster?

[binbandit]

Maybe add to the docs which PR size will likely get accepted, or reviewed faster?

I like the idea, but i dont want to give people hope that their PR will be reviewed over someone else's because its small etc.

[Bashamega]

You can make like a table simmiliar to this:

Label	Approx. merge rate
big	25 %
small	75 %
large	15 %

This is generated by ai it will be customized, of course.