Move utils in file instead of folder.

aidge_core/aidge_export_aidge/utils/__init__.py → aidge_core/aidge_export_aidge/utils.py

-from .operator_registry import *
-
 def parse_node_input(node_inputs: list) -> list:
     """Parse node intputs in order to adapt the list for Jinja.
 

aidge_core/aidge_export_aidge/utils/operator_registry.py

-OPERATORS_REGISTRY = {}
-
-def operator_register(*args):
-
-    key_list = [arg for arg in args]
-
-    def decorator(operator):
-        def wrapper(*args, **kwargs):
-            return operator(*args, **kwargs)
-
-        for key in key_list:
-            OPERATORS_REGISTRY[key] = operator
-
-        return wrapper
-    return decorator
-
-def supported_operators():
-    return list(OPERATORS_REGISTRY.keys())