Draft: Add generic export interface to plotting framework

This MR adds the export option to plot configurations.

Can this MR be accepted?

• Implementation ready
  • General export interface
  • save (depending on creator, controlling save_figure plot helper)
  • reveal (via click, OS-specific)
  • open (via click, OS-specific)
  • show (interactively, depending on creator, e.g. plt.show)
  • ipynb_display (if in notebook environment)
• 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 #323