[Add] Clip Operator

-Added tensors of empty shape to represent min and max attributes.

-ForwardDims can now copy min and max tensors into the attributes. In case of conflicts, the data inside the tensors takes precedence over the class attributes.

-Created unit test cases to validate this behavior.

-Implemented Python bindings for the class.

See Issue:aidge_quantization#38 (closed)

Main difference with !190 (closed): Changing Min and Max Attributes into OptionalData inputs to make the Operator compatible with ONNX

Add Clip Operator