Fix missing Python parameter type defaults

[kieran-ryan]

🤔 What's changed?

The project documentation outlines for Customer Parameter Types that use_for_snippets "Defaults to true" and that prefer_for_regexp_match "Defaults to false".

Although this aligns with the documented Python example, its implementation is missing default values for those keyword arguments:

class ParameterType:
    def __init__(
        self,
        name,
        regexp,
        type,
        transformer,
        use_for_snippets,
        prefer_for_regexp_match,
    ):

With this PR:

1. The appropriate defaults have been added to the ParameterType class.
2. Two versions of Python type hints in the module defining that class have been reduced to one e.g. typing.List and list (through__future__.annotations).

⚡️ What's your motivation?

• Fix a bug where default keyword arguments were not set for customer parameter types in Python
• Remove invalid documentation that alternatives can not be escaped

🏷️ What kind of change is this?

• :bug: Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

Whether small correction to alternatives in README.md is appropriate.

📋 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.

[kieran-ryan]

Appreciate the considered feedback @mpkorstanje - refined PR scope accordingly