Describe the workflow you want to enable

Add a pos_label parameter to TargetEncoder to enable the user to specify which label should be the positive class when the target is binary.

Describe your proposed solution

Add a pos_label parameter that is passed to the LabelBinarizer pos_label parameter.

Describe alternatives you've considered, if relevant

No response

Additional context

Ref: #26674 (comment)

cc @ogrisel