feat: Add "low color" mode

[twolodzko]

In some color configurations, eza uses a lot of colors for different items in the output. I personally find it distracting (mostly the file permissions in -l mode). I could use --color never, but I wouldn't mind if eza colored only the file and directory names as ls. I could also use EXA_COLORS to individually turn off each of the components, but this is not well documented and needs individually blacklisting each of them. I'd love to have something like --color ls which just uses the same colors as ls does, not more.