[feature] add meta property to records (#1627)

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

packages/editor/src/lib/components/ShapeIndicator.tsx

@@ -11,7 +11,7 @@ import { OptionalErrorBoundary } from './ErrorBoundary'
 class ShapeWithPropsEquality {
 	constructor(public shape: TLShape | undefined) {}
 	equals(other: ShapeWithPropsEquality) {
-		return this.shape?.props === other?.shape?.props
+		return this.shape?.props === other?.shape?.props || this.shape?.meta === other?.shape?.meta
 	}
 }