This PR adds a `meta` property to shapes and other records.
It adds it to:
- asset
- camera
- document
- instance
- instancePageState
- instancePresence
- page
- pointer
- rootShape
## Setting meta
This data can generally be added wherever you would normally update the
corresponding record.
An exception exists for shapes, which can be updated using a partial of
the `meta` in the same way that we update shapes with a partial of
`props`.
```ts
this.updateShapes([{
id: myShape.id,
type: "geo",
meta: {
nemesis: "steve",
special: true
}
])
```
## `Editor.getInitialMetaForShape`
The `Editor.getInitialMetaForShape` method is kind of a hack to set the
initial meta property for newly created shapes. You can set it
externally. Escape hatch!
### Change Type
- [x] `minor` — New feature
### Test Plan
todo
- [ ] Unit Tests (todo)
### Release Notes
- todo
