Allow passing arrays to coordinate transformation methods

[ortk95]

Array transformation methods (e.g. radec2lonlat) can now transform arrays of coordinates, in addition to coordinates for a single point.

If the input coordinates are both floats, then the method will return a tuple of floats (i.e. the existing behaviour). If either of the input coordinates are arrays, then the inputs will be broadcast together, and a tuple of NumPy arrays will be returned. There are no restrictions on the shape and number of dimensions of the input arrays - the only requirement is that the input arrays can be broadcast together.

For example:

body = planetmapper.Body('Jupiter', utc='2005-01-01T00:00:00')

print(body.lonlat2radec(180, 0))
# (196.3742463154229, -5.566702383405959)
print(body.lonlat2radec(np.arange(360), np.zeros(360)))
# (array([196.36993081, ..., 196.37000169]), array([-5.5652366 , ..., -5.56527024]))
print(body.lonlat2radec(np.array([1,2]), np.array([[1,2],[3,4]])))
# (array([[196.36989221, 196.36985491], [196.3699572, 196.36992117]]), array([[-5.56513378, -5.56503142], [-5.56499563, -5.5648938 ]]))

Closes #358

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 9564560155

Details

• 57 of 57 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 99.61%

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Totals
Change from base Build 9547931142:	0.005%
Covered Lines:	3101
Relevant Lines:	3113

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