Introduce padding in the PropList

[bieleluk]

The current implementation of the PropList does not implement padding between key-value, nor between prop pairs. It is possible to use paragraph function with_spacing to introduce the spacing between each to paragraphs but the result does not look good, specifically in eckhart layout.
The goal is to add this padding directly to the PropList implementation.

On top of that, the ConfirmValueParams strongly resembles the PropList with 3 properties so we should find out if it's feasible to fuse them into one struct.