Use getitem dunder for StatementHandlerRegistry

Author: r41k0u

pythonbpf/functions/func_registry_handlers.py

@@ -17,6 +17,6 @@ def decorator(handler):
         return decorator
 
     @classmethod
-    def get_handler(cls, stmt_type):
+    def __getitem__(cls, stmt_type):
         """Get the handler for a specific statement type."""
         return cls._handlers.get(stmt_type, None)