bug#47316: 27.1; commands with color input should use a common color chooser

[scame]

> read-color will show you the colors from which you can select if you type 
> '?', the standard Emacs command that requests the list of possible candidate 
> values.

Yes, I mentioned it in my mail:

> > set-foreground-color uses a color chooser: read-color.

But customize use a different implementation, not read-color (at least on 27)
and other commands do not use read-color at all, despite getting color input,
they just list the color names without coloring them.

Other commands which read a face, not a color, show just face names for
completion. Showing face colors and other attributes inline (like in case
of list-faces-display) could be a nice improvement.