feat(store-sync): apply logs as one stash update

[holic]

pulled out of #3240

like zustand storage adapter, this applies all logs as one applyUpdates operation, resulting in one subscriber emission instead of one per log

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[holic]

feels a little weird to do all this tracking here, might be nice if in the future stash would export a util for this like

mutate(({ getRecord, setRecord }) => {
  getRecord(...);
  setRecord(...);
});

where it internally keeps track of the pending updates/mutations and applies them all at the end of the function execution