feat(expect): add ArrayOf asymmetric matcher

[icholy]

Summary

This PR adds a new asymmetric matcher expect.arrayOf(sample) and its inverse expect.not.arrayOf(sample). This matcher simplifies assertions on arrays by validating that all elements match a provided condition. I don't think that not.arrayOf is particularly useful, but I included it for the sake of symmetry.

Example:

expect(value).toMatchObject({
  items: expect.arrayOf(
    expect.objectContaining({
      id: expect.any(String),
    }),
  ),
});

Test plan

I've added tests which are comparable to the other asymmetric matcher tests.

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[icholy]

I'm not seeing my documentation changes in the preview link. Did I miss a build step?