Add ability to manage field groups/categories in form builder

[engram-design]

Currently, we group fields in the form builder as the below:

• Common Fields
• Advanced Fields
• Element Fields

We should allow users to manage these groups, including the order, and what fields are shown. Fields cannot be removed, but they can be disabled. Field type names can also be changed ("Single-Line Text" to "Text" for example).

This would replace the current Formie > Settings > Fields > Disabled Field Types setting.