yjs example (#1560)

This PR adds a yjs example to the examples app.

### Change Type

- [x] `internal` — Any other changes that don't affect the published
package (will not publish a new version)

### Release Notes

- [editor] Adds yjs example project

packages/editor/src/lib/config/createTLStore.ts

@@ -1,4 +1,4 @@
-import { Migrations, Store, StoreSnapshot } from '@tldraw/store'
+import { HistoryEntry, Migrations, Store, StoreSnapshot } from '@tldraw/store'
 import { TLRecord, TLStore, createTLSchema } from '@tldraw/tlschema'
 import { TLShapeUtilConstructor } from '../editor/shapeutils/ShapeUtil'
 
@@ -16,6 +16,9 @@ export type TLStoreOptions = {
 	defaultName?: string
 }
 
+/** @public */
+export type TLStoreEventInfo = HistoryEntry<TLRecord>
+
 /**
  * A helper for creating a TLStore. Custom shapes cannot override default shapes.
  *