Add simple form builder

[simpleidserver]

• Can add column : same as https://grapesjs.com/demo.html : OK
• Can add element into column : OK
• Can remove column : OK
• Add text : OK
• Configure the number of columns : OK
• Refactor the UI : add multiple tabs ... : OK
• Add specific view to manage notification : OK
• Fix integration tests : OK
• Update the HumanTask UI : OK
• Display the HumanTask UI in the task view : OK
• Fix EF for CaseManagement project : TODO
• Fix EF for BPMN project : TODO