Add ability to optionally auto-create a Project and assign to user when creating a Dataset from the portal

[ri-pandey]

When creating a Dataset from the portal, via either the Upload or the Import methods, if the person creating the Dataset has role user, and they do not have any Projects assigned to them, they will have no way of accessing the Dataset after its creation, since the user role can only access Datasets via Projects that they are assigned to.

To fix this, add an optional ability to create a new Project for such users, and assign the Dataset being created to the Project, while adding the user as an assignee to the Project as well.