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?

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

📋 Checklist:

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

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[coveralls]

coverage: 98.402% (+0.007%) from 98.395%
when pulling 3f259fe on feat/loader-option
into 8f96d9f on main.