feat: Add exponentiation operator to CSEMachine (#32)

The code changes add support for the exponentiation operator (`**`) in the `CSEMachine` class. This allows for performing exponentiation calculations in the interpreter.

Author: codebyrpp

src/interpreter/cse_machine/__init__.py

@@ -280,6 +280,7 @@ def exitEnv(self, env_marker):
         "+": lambda rator, rand: rator + rand,
         "-": lambda rator, rand: rator - rand,
         "*": lambda rator, rand: rator * rand,
+        "**": lambda rator, rand: rator ** rand,
         "/": lambda rator, rand: int(rator / rand),
         "or": lambda rator, rand: rator or rand,
         "&": lambda rator, rand: rator and rand,