Add new widget for multi-valued primitive property

Today, we use the nuxeo-data-table to handle a multi-valued primitive property (i.e. list of string, date, number, etc.).

A table is not needed, a list will do the job.

Moreover, this would solve the limitation for handling a complex multi-valued property with only one sub-property described in ELEMENTS-910.

It would be just a matter of using an repeat structure with a Add button opening a pop up showing something similar to nuxeo-data-table-form.js + ordering ablity.