Revert "RBush again? (#3439)" (#3481)
This reverts commit 45dffd1af6.
Revert rbush. There's issues with shapes that have computed bounds
(arrows, groups).
### Change Type
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- [ ] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
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- [x] `internal` — Does not affect user-facing stuff
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- [x] `bugfix` — Bug fix
- [ ] `feature` — New feature
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- [ ] `galaxy brain` — Architectural changes
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- [ ] `dunno` — I don't know
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88ee4e9993