Add support for clojure language

[p14n]

🤔 What's changed?

Added support for the Clojure language.

⚡️ What's your motivation?

Currently, the Cucumber plugin in Vscode does not recognise step definitions written in clojure. This is the sedond step; and relies on the merge and release of cucumber/language-service#309. The final step will be:

cucumber/vscode — Add { scheme: 'file', language: 'clojure' } to documentSelector in src/extension.ts, and add .clj glue patterns to the defaults in package.json, and update dependencies.

No tests were added - there are no existing tests for other languages at this level.

🏷️ 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.