This PR adds two new component overrides to the editor's `components`
slot. They are:
- `<OnTheCanvas/>`, which renders inside of the html layer that scales
and translates with the camera
- `<InFrontOfTheCanvas/>`, which renders in front of the canvas but
behind any UI elements, and which does not scale / pan with the camera.
### Change Type
- [x] `minor` — New feature
### Test Plan
1. See the "on the canvas" example.
### Release Notes
- [editor] Adds two new components, `OnTheCanvas` and
`InFrontOfTheCanvas`.
1367e4c500