Resolve "Add `plt.errorbar` to multiplot functions"

This MR adds plt.errorbar to MULTIPLOT_FUNC_KINDS in _multiplot.py.

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
  • squash option set
  • Changelog entry added
  • Version number bumped
  • Reviewed & approved by @blsqr

Related issues

Closes #329 (closed)