[IDEA] add a 'format' attribute to EditTextWidget (and maybe others)

[ittayd]

Is your feature request related to a problem? Please describe. When creating calculatros, a lot of time a field will hold an accurate number (e.g. 293.70629370629365), but I want to see something rounded (293.71). The accurate number may come because of some calculation derived from other fields (the edit text widget is used to override it, so then the user can type what they want)

Describe the solution you'd like A format attribute can hold a filter to format the value before setting it in the input element.

Describe alternatives you've considered

Additional context