Add tuple pattern matching support

[qodot]

Summary

• Add tuple pattern matching for compound pattern scenarios (e.g., (Dog, Car), ("success", "instagram"))
• Support multi-argument lambdas that receive unpacked tuple elements
• Refactor codebase: extract ExhaustiveError and helper functions to separate modules

Changes

New Features

• Tuple pattern matching: Match against tuple patterns combining types and literals
  • Value tuples: ("success", "instagram")
  • Type tuples: (Dog, Car)
  • Mixed tuples: ("instagram", Dog)
• Multi-arg lambda support: lambda d, c: f"{d.speak()} {c.drive()}"

Refactoring

• Extract ExhaustiveError to error.py
• Extract helper functions to helper.py:
  • is_not_callable(), is_class(), get_callable_param_count()
  • is_tuple_pattern(), match_element(), match_tuple()
  • unwrap() with tuple unpacking support
• Add check_match() function for unified pattern matching logic

Tests

14 new tests added in test_match__tuple.py covering all tuple pattern scenarios.