Is your feature request related to a problem? Please describe.

I would like to adapt the output of gum log to the shell color theme that I use (shoutout to catppuccin) so that all levels have clear contrast over the background and are comfortable to read. The defaults are, at least to my eyes, not ideal:

While I can set GUM_LOG_LEVEL_FOREGROUND, that changes the color for all levels:

While it's conceivable to do this in an application or elaborate scripts that wrap logging, it's not useful as a user-level setting, which I need to adapt to my local shell theme.

Describe the solution you'd like

Split GUM_LOG_LEVEL_FOREGROUND and GUM_LOG_LEVEL_BACKGROUND into separate environment variables for each log level, e.g. GUM_LOG_LEVEL_DEBUG_FOREGROUND.

Describe alternatives you've considered

• In the script(s) using gum, use the existing variables to forward user-level setting to gum log, with reasonable defaults.
  👎️ Having to change all scripts that use gum log seems like unnecessary overhead, and artificial complexity for all users of shared scripts that do not want to customize colors.
• Introduce the concept of themes / color palettes to gum overall, as opposed to re-configuring each element of each command individually.
  🤷 Seems like a good idea to me, but that's probably be a major piece of work, including refactoring of all commands.
• gum could transparently use the color palette of the terminal/shell as default, and be compatible by definition.
  🤔 While probably the ideal outcome for most users, this is probably a can of worms.

Additional context

• From the documentation and help output of gum, I find it hard to determine which values to assign to style variables. Maybe it's very clear if you're familiar with lipgloss; as a "naive" user of gum to spice up shell scripts, it isn't.
• A side note: While setting a bunch of environment variables in a user-level "config" file (think dotfiles) is feasible, the lack of a proper config file for gum is noticeable. If there are no strong reasons against having one, it may be something to consider.