esm: rename bin script file to avoid loader issues

[davidjgoss]

🤔 What's changed?

This PR renames the file in bin from cucumber-js to cucumber.js, and changes the documentation for ESM to say that we can support loaders.

⚡️ What's your motivation?

This is to avoid issues when using some ESM loaders, where Node.js doesn't understand what to do with the extensionless file. Fixes #1844 (which also gives details of the issues being encountered), and tested against the minimal example repo there which confirmed the fix.

Note that this isn't a breaking change - users will continue to run cucumber-js because npm symlinks that command to whatever file is specified in the bin section of the package.json. Nonetheless, we'll put it in a minor release just to be a little defensive. Mocha has done the same thing for the same reasons in mochajs/mocha#4863.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)
• 🐛 Bug fix (non-breaking change which fixes a defect)

📋 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 remained the same at 98.235% when pulling 5565cb7 on fix/loader-hooks-extension into 024911b on main.