Accept arrays in `graphic2centric_lonlat` and `centric2graphic_lonlat`

[ortk95]

Transformations between planetographic and planteocentric longitude/latitude coordinates can now accept arrays, in addition to floats. This is a direct continuation of the work in #370.

Closes #374

Pull request checklist

• [x] Add a clear description of the change
• [x] Add any new tests needed
• [x] Run spell check on new text visible to user (documentation, GUI etc.)
• [x] Check any changes to requirements.txt are reflected in setup.py and conda-forge feedstock
• [x] Check code passes CI checks (run run_ci.sh or check GitHub Actions)

See CONTRIBUTING.md for more details.

[coveralls]

Pull Request Test Coverage Report for Build 9711487736

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 99.611%

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Totals
Change from base Build 9699565342:	0.001%
Covered Lines:	3105
Relevant Lines:	3117

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💛 - Coveralls