[model editor] Help user to know a field is optional or required

[iapyeh]

On the Node-RED editor, there are many input fields on the prompted property form of a component . Some fields are required and some are optional. These fields have to be marked, so that users can fill the form correctly to successfully build their model.

[MercSaturn]

宗明 had finished the required table, passing issue to 宗育