[Future Spherical Class] Add SPoint and SMultiPoint

[ghiggi]

This PR add the SPoint and SMultiPoint class of the future spherical geometry interface.

• Tests added
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff

[codecov]

Codecov Report

Merging #465 (a48ac65) into main (5f53ecd) will decrease coverage by 0.03%.
The diff coverage is 92.96%.

@@            Coverage Diff             @@
##             main     #465      +/-   ##
==========================================
- Coverage   94.27%   94.24%   -0.04%     
==========================================
  Files          69       73       +4     
  Lines       12394    12703     +309     
==========================================
+ Hits        11685    11972     +287     
- Misses        709      731      +22     

Flag	Coverage Δ
unittests	94.24% <92.96%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/spherical.py	92.67% <80.17%> (-5.55%)	⬇️
pyresample/future/spherical/__init__.py	100.00% <100.00%> (ø)
pyresample/future/spherical/point.py	100.00% <100.00%> (ø)
pyresample/test/test_sgeom/__init__.py	100.00% <100.00%> (ø)
pyresample/test/test_sgeom/test_point.py	100.00% <100.00%> (ø)
pyresample/test/test_spherical.py	100.00% <100.00%> (ø)
pyresample/_multi_proc.py	83.01% <0.00%> (+1.88%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[coveralls]

Coverage remained the same at 93.761% when pulling a48ac65 on ghiggi:feature-spoint into 5f53ecd on pytroll:main.

[ghiggi]

@djhoese @mraspaud this is ready for review.
Tomorrow I have faculty meetings, but I can finalize the last details on Friday if you manage to review it tomorrow.
This PR is required for the next SArc class PR

[mraspaud]

Thanks for taking on the job of renovating this part of Pyresample, it is highly needed! Some suggestions, questions and comments inline.

[mraspaud]

Thanks, starts to look good.

[djhoese]

This is looking really good. I haven't kept up on this development so I had a lot of questions and a couple requested changes, but otherwise I like how you cleaned up the code.

One other suggestion that may help tests in the future, should some of these SCoordinate objects you use in the tests be pytest fixtures or other helper methods so the code to generate them doesn't get repeated all over the tests? I see some of them are unique, but also some use the same angles as inputs.

Again, nice job, just a few more things.

[ghiggi]

@mraspaud @djhoese ready for merging I guess ;)

[ghiggi]

I just added a small class method from_degrees to avoid calling np.deg2rad in many occasions when creating the object

[djhoese]

This looks good enough for me that it shouldn't be holding up any other PRs. I had one comment about something I wouldn't mind changed, but it isn't as big of a deal as the other stuff you've already fixed.