Add column padding option

[camro]

Is your feature request related to a problem? Please describe.
Currently, we can't have padding on columns unless we add it manually.

Describe the solution you'd like
Add the ability to have padding on columns

[dionysous]

In my opinion does the padding of the columns in the frontend belong to the theme, where it should be declared in general for all columns. Otherwise you have to set up every single column for a specific padding value. 🤔

[mor10]

Columns are laid out using flex which means as of right now, each variant (2 columns, 3 columns, 4 columns, etc) needs its own rule to describe the width of each column. I say right now because eventually the gap property will work with flex allowing us to set one value for the gap between columns. That is in the future though. For now, to create gaps between columns you must set the width of each of the items within the flexible box.

For reference: https://developer.mozilla.org/en-US/docs/Web/CSS/gap

[mtias]

Consolidating in #10730 which has a bit more activity.