Add a standalone "pygmt.Figure.errorbar" method

### Description of the desired feature

[pygmt.Figure.plot](https://www.pygmt.org/dev/api/generated/pygmt.Figure.plot.html) allows to add errorbars to data points. The current syntax for the `error_bar` parameter is:

[**x**|**y**|**X**|**Y**][**+a**|**A**][**+cl**|**f**][**+n**][**+w***cap*][**+p***pen*]

However, a standalone `pygmt.Figure.errorbar` method seems more Pythonic and userfriedly.

_First suggested by @seisman in https://github.com/GenericMappingTools/pygmt/pull/2429#issuecomment-1501509387_:
> Maybe we should add a standalone Figure.errorbar() method, like https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.errorbar.html.

Related to PR #2429

### Are you willing to help implement and maintain this feature?

No