Create an how to implement a save work in progress button for a workflow

With NXS-1210 it is possible to let users save their work in progress for a task form without filling all required fields.

Version: 10.3+

Principle is:

• Create a save work in progress button (resolution actions)
• Disable "validate form" => we don't check for required fields anymore when clicking this button
• Corresponding transition links back to the same task => if you press this button you go back to the same task, except progress has been saved

Ideally we should show a notification but we're missing client side automation to easily display a message in this scenario.