feat: add basic variable typing to function inputs

[tsutterley]

refactor: renamed coordinate reference system conversion functions

[codecov]

Codecov Report

Patch coverage: 65.64% and project coverage change: +1.14 🎉

Comparison is base (51f22b2) 61.83% compared to head (11f52a8) 62.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   61.83%   62.98%   +1.14%     
==========================================
  Files          55       40      -15     
  Lines        7735     7507     -228     
  Branches      796      798       +2     
==========================================
- Hits         4783     4728      -55     
+ Misses       2643     2467     -176     
- Partials      309      312       +3     

Flag	Coverage Δ
unittests	62.98% <65.64%> (+1.15%)	⬆️

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

Impacted Files	Coverage Δ
pyTMD/convert_model_crs.py	0.00% <0.00%> (ø)
pyTMD/convert_ll_xy.py	50.00% <33.33%> (-17.68%)	⬇️
pyTMD/convert_crs.py	64.28% <64.28%> (ø)
pyTMD/check_tide_points.py	66.66% <75.00%> (ø)
pyTMD/io/ATLAS.py	40.78% <80.00%> (+0.14%)	⬆️
pyTMD/io/FES.py	45.66% <81.81%> (+0.18%)	⬆️
pyTMD/predict.py	86.95% <88.88%> (+0.05%)	⬆️
pyTMD/time.py	67.66% <95.65%> (+1.82%)	⬆️
pyTMD/utilities.py	52.32% <96.00%> (+9.86%)	⬆️
pyTMD/__init__.py	100.00% <100.00%> (ø)
... and 15 more

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