This PR restores camera culling behavior and includes a 500ms forced
render while the camera is moving to prevent weird long pan behavior.
It:
- removes `CameraManager`
- adds `cameraState` to editor
### Change Type
- [x] `major` — Breaking change
### Release Notes
- [editor] Adds `Editor.cameraState`
- Adds smart culling to make panning and zooming more smooth
bdd8913af3