Based on #1549, but with a lot of code-structure related changes backed
out. Shape schemas are still defined in tlschemas with this diff.
Couple differences between this and #1549:
- This tightens up the relationship between store schemas and editor
schemas a bit
- Reduces the number of places we need to remember to include core
shapes
- Only `<TLdrawEditor />` sets default shapes by default. If you're
doing something funky with lower-level APIs, you need to specify
`defaultShapes` manually
- Replaces `validator` with `props` for shapes
### Change Type
- [x] `major` — Breaking Change
### Test Plan
1. Add a step-by-step description of how to test your PR here.
2.
- [x] Unit Tests
- [ ] Webdriver tests
### Release Notes
[dev-facing, notes to come]
1927f88041