Add support for ESM loaders

[davidjgoss]

🤔 What's changed?

Adds a loader option to register loader hooks ahead of importing user code.

Updates documentation accordingly and also refreshes broader ESM documentation which was a little stale.

Also, makes the whole support block in the loadSupport and runCucumber API functions usable as a partial object - you can specify any/all of its props and it will default the rest. This is a pattern we should consider rolling out to the other blocks of the API options, otherwise we'll be making breaking changes whenever we add new props.

⚡️ What's your motivation?

Fixes #2364.

WIll provide a much better UX for folks doing TypeScript+ESM.

🏷️ What kind of change is this?

• :zap: New feature (non-breaking change which adds new behaviour)

📋 Checklist:

• [x] I agree to respect and uphold the Cucumber Community Code of Conduct
• [x] I've changed the behaviour of the code
  • [x] I have added/updated tests to cover my changes.
• [x] My change requires a change to the documentation.
  • [x] I have updated the documentation accordingly.
• [x] Users should know about my change
  • [x] I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

---

This text was originally generated from a template, then edited by hand. You can modify the template here.

[coveralls]

coverage: 98.402% (+0.007%) from 98.395% when pulling 3f259feb11e942fd6474ee03aad2f0b718757936 on feat/loader-option into 8f96d9f8c7eb005e8f3a63f95762a81e8b526bec on main.