First draft of the new bindings API. We'll follow this up with some API
refinements, tests, documentation, and examples.
Bindings are a new record type for establishing relationships between
two shapes so they can update at the same time.
### Change Type
- [x] `sdk` — Changes the tldraw SDK
- [x] `feature` — New feature
### Release Notes
#### Breaking changes
- The `start` and `end` properties on `TLArrowShape` no longer have
`type: point | binding`. Instead, they're always a point, which may be
out of date if a binding exists. To check for & retrieve arrow bindings,
use `getArrowBindings(editor, shape)` instead.
- `getArrowTerminalsInArrowSpace` must be passed a `TLArrowBindings` as
a third argument: `getArrowTerminalsInArrowSpace(editor, shape,
getArrowBindings(editor, shape))`
- The following types have been renamed:
- `ShapeProps` -> `RecordProps`
- `ShapePropsType` -> `RecordPropsType`
- `TLShapePropsMigrations` -> `TLPropsMigrations`
- `SchemaShapeInfo` -> `SchemaPropsInfo`
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Co-authored-by: David Sheldrick <d.j.sheldrick@gmail.com>
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