Color operators with to_oiio_args method.

[jakubjezek001]

Is there an existing issue for this?

• I have searched the existing issues and added correct labels.

Please describe the feature you have in mind and explain what the current shortcomings are?

All operators should have access to to_oiio_args because they all need it at some point. Currently, only reposition operators provide it.

Suggested implementation?

Adding the method to color operator class. Best to also add add it into BaseOperator class as @abstractmethod.

Describe alternatives you've considered:

No response