[Feature] Abc anchor and Geo aspect

[cvanelteren]

Mixed plots with GeoAxes and normal cartesian plots are a bit cumbersome to deal with. The major issue is that cartopy will adjust the subplot dimension such that it matches the aspect ratio of the plot. This makes the subplot look good, but runs into issues when we have multiple subplot kinds within one figure. This PR will introduce 2 new options.

With abcanchor users can now override the default behavior of putting the abc in the top left corner, by stating the alignment point. For example, setting abcanchor="slot" will set the anchor mode to be within the "slot" of the layout rather than the axes as a reference point.

In addition, aspect can now be set on geo axes (i.e. aspect = "auto"); this aids in forcing aspect to match the rest of the plot rather than the reshaping performed by cartopy.

I think these features together will give users within geoscience more power and flexibility.

snippet

import ultraplot as uplt

layout = [[1, 2], [3, 4]]
fig, axs = uplt.subplots(
    layout,
    proj={4: "cyl"},
    share=False,
)
axs.format(abc = True)
axs.format(land = True, landcolor = "k", oceancolor = 'ocean blue', ocean = True, abcanchor = "slot")

[codecov]

Codecov Report

❌ Patch coverage is 77.14286% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ultraplot/axes/geo.py	56.75%	10 Missing and 6 partials ⚠️

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