Remote ID needs a form-display widget

I'm not sure why this issue was closed. This isn't a duplicate of #2958835: Provide a default formatter for for the remote ID field. → , it was split off from that issue on purpose as discussed in https://www.drupal.org/project/commerce/issues/2958835#comment-14464129 →

The current widget I have needs work, but it's worth discussing and addressing separately from the formatter that was created in the related ticket.