createForm creates a form, then can add its description, settings, and initial
items in display order.
Example
Inputs
title is required. documentTitle defaults to title; description is
optional. settings can set emailCollection (none, verified, or
respondentInput) and/or isQuiz. items accepts the item definitions listed
on Add item.
Set unpublished: true to create the form unpublished and not accepting
responses. account selects the Google account.
Output
Returns the complete createdForm; see Get form. Provider-generated item and question IDs appear in this result.