This PR moves our "fractical indices" library into its own package.
- [x] `major` — Breaking Change
### Release Notes
- [@tldraw/editor] Remove fractional indices code into `@tldraw/indices`
- [@tldraw/indices] Create library for fractional indices code
Adds webdriver tests for testing from a users perspective via browser
actions. We currently support local test runners for a bunch of actions
on desktop `chrome`/`firefox`/`edge`/`safari` on macos.
We also have a browserstack runner which we'll enable in another PR.
### Release Note
- Adds initial webdriver tests