Rename pipe to CuratedTransformer

[shadeMe]

Description

This needs to be done in order to distinguish this pipe from the TrainablePipe implemented in spacy-transformers (which is also called Transformer).

After merging, we'll need to publish a new minor release and retrain the models.

Types of change

Refactor

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.