Switch to ESM

[davidjgoss]

🤔 What's changed?

This package is now an ES module (ESM), meaning the context you consume it in must support ESM. In practise, that's module bundlers like Webpack and Vite which is all fine, so there is no need to have the transitional step of a "hybrid" package like we have done with cucumber-js and our another Node.js-oriented packages.

The significant changes are to config and setup code, and some dependencies which needed bumping to fix issues with types etc. On the other hand, the majority of the diff is adding .js suffixes to relative imports in TS files, which looks weird but is correct (I switched on a lint rule so we always do that in future).

This is a big change and as such I've dropped this into html-formatter locally, built it and used it with cucumber-js and done some exploratory testing, and everything is working as expected.

Also whilst this will be exactly the same behaviour for end users of formatters, this should be released as a major since anyone directly using the components may have some config/tooling changes to adopt.

⚡️ What's your motivation?

This will enable us to consume ESM-only dependencies where we have recently been blocked on upgrading or adopting them.

Fixes #7

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)
• 💥 Breaking change (incompatible changes to the API)

📋 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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[davidjgoss]

(Ignore Netlify issues - these were already present and will be fixed by #337.)