Add ParameterInfo

[aslakhellesoy]

🤔 What's changed?

I have modified the TypeScript implementation to add the following:

• GeneratedExpression#parameterInfos => ParameterInfo[]
• Made ParameterType#type public and improved the typings
• Fixed the type on a couple of built-in parameter types

⚡️ What's your motivation?

My motivation is to implement a "quick fix" for undefined steps in the language server - see https://github.com/cucumber/language-server/pull/45/files

It uses the new ParameterInfo object to generate step definitions for multiple languages (using a Mustache template).
In order to do this for statically typed languages, we need to know the type of each parameter.

🏷️ 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.