Describe the workflow you want to enable

ColumnTransformer does not support partial_fit() even if individual transformers do (like StandardScaler). Is it possible to add a partial_fit routine?

Describe your proposed solution

1. Don't reset state
2. Add _partial_fit to pipeline.py. something like:

def _partial_fit_one(transformer, X, y, weight, message_clsname="", message=None, **fit_params):
    """
    Fits ``transformer`` to ``X`` and ``y``.
    """
    with _print_elapsed_time(message_clsname, message):
        return transformer.partial_fit(X, y, **fit_params)

if the transformer hasattr partial_fit

Describe alternatives you've considered, if relevant

No response

Additional context

No response