Implement closures evaluation

[InfoTCube]

Implement closures evaluation in the interpreter

• Extend the interpreter to support evaluation of closure (lambda) expressions.
• Create a runtime representation for closures that includes(mostly already done by code_blocks):
  • Parameter list
  • Closure body (AST node/block)
  • Captured environment (lexical scope) for free variables
• Implement closure invocation, ensuring arguments bind correctly to parameters.
• Support lexical scoping so closures can access variables from the defining environment.
• Handle nested closures and proper environment chaining.