This PR makes a small improvement to the speed of `getShapeAtPoint`. It
removes `Editor.getCurrentPageRenderingShapesSorted`.
### Change Type
- [x] `sdk` — Changes the tldraw SDK
- [x] `improvement` — Improving existing features
Can be useful for ad-hoc measure of performance. One is a method
decorator, which can be use on methods like so:
```typescript
@measureDuration
someLongRunningProccess() {
// ....
}
```
And the other offer more granular control. It also returns what the
callback returns, so it can be use in assignments / return statements.
```typescript
return measureCbDuration('sorting took', () => renderingShapes.sort(sortById))
```
### Change Type
<!-- ❗ Please select a 'Scope' label ❗️ -->
- [ ] `sdk` — Changes the tldraw SDK
- [ ] `dotcom` — Changes the tldraw.com web app
- [ ] `docs` — Changes to the documentation, examples, or templates.
- [ ] `vs code` — Changes to the vscode plugin
- [x] `internal` — Does not affect user-facing stuff
<!-- ❗ Please select a 'Type' label ❗️ -->
- [ ] `bugfix` — Bug fix
- [ ] `feature` — New feature
- [ ] `improvement` — Improving existing features
- [ ] `chore` — Updating dependencies, other boring stuff
- [ ] `galaxy brain` — Architectural changes
- [ ] `tests` — Changes to any test code
- [x] `tools` — Changes to infrastructure, CI, internal scripts,
debugging tools, etc.
- [ ] `dunno` — I don't know
