fix: resolve CI type annotation issues

- Add missing imports (Optional, Dict, List, TYPE_CHECKING) to affected modules
- Add return type annotation -> None for __init__ methods
- Add type annotations for ast dict and scenario variables
- Create _colorize helper function to fix invalid fg parameter
- Add type ignore comment for analyze_ambiguity return value

src/nl2gherkin/gherkin/parser.py

@@ -1,4 +1,4 @@
-"""Gherkin parser for validation."""
+ """Gherkin parser for validation."""
 
 import re
 from typing import List, Optional, Tuple