Support externalising attachments in HTML formatter

[davidjgoss]

🤔 What's changed?

• Updates HTML formatter version (brings in support for externalised attachments, links)
• Adds option to externalise attachments for HTML formatter, with code to rewrite most attachment messages accordingly if on
  • The exceptions are logs and links, which being short (and with logs potentially numerous) would have little or no value being externalised
• Adds link function on the world for adding links to URLs as attachments

⚡️ What's your motivation?

The cucumber-js version of both

• cucumber/html-formatter#281 and
• cucumber/common#2191

(These are two different wins for users, but there was enough technical overlap that it made sense to just ship them as one PR.)

🏷️ 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.

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[coveralls]

coverage: 97.944% (-0.02%) from 97.961% when pulling 5fdd358eff913ce13565ceb1472f9fb2466a2900 on feat/html-externalise into 4c67f49687e8039967c217e129454362e4c536ca on main.

[coveralls]

coverage: 97.944% (-0.02%) from 97.961% when pulling 2db209bd6db52539ebe913318e81f94ca79054b5 on feat/html-externalise into 4c67f49687e8039967c217e129454362e4c536ca on main.

[coveralls]

coverage: 97.946% (-0.02%) from 97.961% when pulling 9cfdb2b0d52a8ad39cb83e8ad14417fb11c12dc6 on feat/html-externalise into 551efa2a6d39f79bbf5b7ec31988be7a6c9c6f92 on main.