feat: py bindings refactoring

[stefan-gorules]

Python Bindings Refactoring & API Improvements

This PR introduces significant improvements to the Python bindings, focusing on better ergonomics, simplified type handling, and enhanced async support. It also adds version information to the package.

Features

• ✨ Improved type handling with direct JSON string/bytes support
• 🚀 Enhanced async loader capabilities with proper task locals handling
• 🔄 Simplified context passing and evaluation options
• 📝 Added comprehensive type hints via .pyi stub file

API Improvements

# Before
engine.evaluate("decision_key", {"data": "value"}, {"max_depth": 10})

# After
engine.evaluate("decision_key", '{"data": "value"}')  # Now accepts JSON strings
engine.evaluate("decision_key", context_dict, {"max_depth": 10, "trace": True})