Create Default Form When Pub Type Is Created

[gabestein]

Motivation

So admins have a form to edit when they create a new type. So devs have a form to render on new Pub edit/creation pages.

Requirements

• When a new Pub Type is created, an accompanying new default Form for the type is created, following the current heuristics for the default form.
• Default form has name “ Editor (Default)”

Acceptance Criteria

• Should specify the same form input types given field schema types as the current default form editor
• Should use the title of the field, not the slug, as the “Label” for each form field.
• Should add a paragraph field at the top with the title of the Pub (or fallback) as text (not markdown, for now).
• Should add a migration to create default forms for existing pub types