feat: improve pnpm sorting

[westrik]

#313 added the ability to deeply sort a pnpm object in package.json. This PR improves pnpm sorting in the following ways:

• groups similar fields together
• sorts pnpm.overrides entries with the same package name using semver rather than alphabetically

Example:

Before this change:

"pnpm": {
  "overrides": {
      "@react-stately/selection@~3.10.3": "3.10.3",
      "@react-stately/selection@~3.7.0": "3.7.0"
  }
}

After this change:

"pnpm": {
  "overrides": {
      "@react-stately/selection@~3.7.0": "3.7.0",
      "@react-stately/selection@~3.10.3": "3.10.3"
  }
}

[keithamus]

@samsternatretool what do you think?

[samsternatretool]

@keithamus LGTM from me! @westrik is on my team at Retool and he noticed some subtlety when it comes to sorting pnpm overrides after we merged my original change.

[keithamus]

Some failing tests in Node 12 because of Array#at. Will need to use an alternative or polyfill.

[westrik]

Some failing tests in Node 12 because of Array#at. Will need to use an alternative or polyfill.

updated with alternative

[github-actions]

🎉 This PR is included in version 2.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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