Prepend context to parameter transformers

[davidjgoss]

🤔 What's changed?

Change the signature of parameter type transformer functions so the TestCaseContext is prepended as the first argument. This needs a bit of gymnastics with wrapping the function in order to achieve what we want within the constraints of the cucumber-expressions API.

At the same time, adopt the changes from cucumber/javascript-core#32 so we're doing a bit more of the lifting with the step arguments.

⚡️ What's your motivation?

Be consistent with step and hook functions (and the Node.js test runner itself) where we prepend the context as the first arg - enabling arrow functions by default - but still supply the world as this for continuity when coming from cucumber-js.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, 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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