[@xstate/store] Add `shallowEqual`

[davidkpiano]

The shallowEqual comparator has been added for selector comparison:

import { shallowEqual } from '@xstate/store';
import { useSelector } from '@xstate/store/react';

import { store } from './store';

function MyComponent() {
  const state = useSelector(
    store,
    (s) => {
      return s.items.filter(/* ... */);
    },
    shallowEqual
  );

  // ...
}

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a7f4fd434121fa5a83d17060dc081a1f9d1d57c8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------- | ----- | | @xstate/store | Minor |

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