Figure.histogram: Split parameter bar_width into bar_width and bar_offset

[yvonnefroehlich]

Description of proposed changes

This PR splits the parameter bar_width into two parameters bar_width and bar_offset to make the codes more Pythonic.
Related to #4279 (comment). Extends #4279

Preview:

• https://pygmt-dev--4316.org.readthedocs.build/en/4316/api/generated/pygmt.Figure.histogram.html#pygmt.Figure.histogram
• https://www.pygmt.org/dev/tutorials/advanced/cartesian_histograms.html#grouped-bars

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[seisman]

Looks good to me, except for one minor comment above. Are there any changes you'd like to make?

[yvonnefroehlich]

Looks good to me, except for one minor comment above. Are there any changes you'd like to make?

I think the image comparison for the new test was missing. I tried to create the baseline image and pushed the DVC file to GitHub and the PNG file to DagsHub. But it looks like something did not work correctly. I remember that there should be a GitHub comment showing a summary of the modified or newly added baseline images. But this is currently not the case.

[seisman]

This is the default file name, so no need to specify it explicitly.

Suggested change

	@pytest.mark.mpl_image_compare(filename="test_histogram_barwidth_baroffset.png")
	@pytest.mark.mpl_image_compare

[seisman]

Actually I feel we don't need to add this test, because there is no complex code logic for these two parameters.

[seisman]

Did you run dvc push?