feat: compiled bytecode

[stefan-gorules]

Expression Engine Optimization

This PR introduces compiled bytecode capabilities and significant performance optimizations to the expression engine. It adds support for pre-compiling expressions and reusing them across multiple evaluations, along with bytecode optimizations for common operations.

Features

• ✨ Added support for compiled expressions that can be reused across evaluations
• 🚀 Implemented Fast Path for member access operations
• 🔧 Optimized bytecode representation with specialized opcodes
• 🏗️ Added new Expression type with Standard and Unary variants
• 📦 Extended Python bindings to support compiled expressions

Example Usage

# Compile once, evaluate multiple times
expr = zen.compile_expression("50 * tax.percentage / 100")

# Single evaluation
result = expr.evaluate({"tax": {"percentage": 10}})

# Batch evaluation
results = expr.evaluate_many([
    {"tax": {"percentage": 10}},
    {"tax": {"percentage": 20}},
    {"tax": {"percentage": 15}}
])

Performance Impact

• Eliminates repeated parsing and compilation overhead
• Optimizes common member access patterns
• Reduces memory allocations during evaluation
• Enables efficient batch processing of expressions