Resolve "Systematically apply the ColorManager across plots"

This MR integrates the ColorManager into facet-grid-based plots using a parsing function, parse_cmap_and_norm_kwargs that is more widely usable.

Can this MR be accepted?

• Implementation ready
• Tests added or adjusted
• Documentation extended or updated

• Code quality
  • Changes follow coding guidelines
  • Checked code coverage on new and adjusted code

• Ready for merging
  • Pipeline passes without warnings
  • History cleaned-up or squash option set
  • Changelog entry added
  • Version number bumped
  • Reviewed & approved by @

Related issues

Closes #312 (closed)