v0.19.8

Fixes a bug where history didn't reliably undo LiveObject key set changes if any pending local changes existed on that key.
Fixes a bug where changes performed inside room.batch were incorrectly ordered inside the history resulting in unexpected undo behavior in some cases.
Fixes a bug where under some circumstances the Liveblocks client could get stuck in a "synchronizing" state indefinitely
Expose JsonArray and JsonScalar types publicly