Feature: The ability to add a user as a member to multiple organizations with one API request.
Description: An endpoint to add a user as a member to multiple organizations with one API request versus adding multiple users to one organization like this. And also the ability to assign the same role in all of the organizations
Use-case: Our customer support users are required to have access to several of our customer Organizations at a time. We would like the ability to add them to multiple organizations, with the same role, all in one request.