feat: add basic file searching with glob strings in definition files for #183

[tsutterley]

• refactor: using pathlib to define and expand paths
• feat: add parser for extracting constituents from filenames
• feat: updated model definition read function for currents
• feat: added iterative methods for converting from cartesian to geodetic
• test: added model definition file tests
• test: add geodetic conversion test

[codecov]

Codecov Report

Patch coverage: 74.95% and project coverage change: +3.99 🎉

Comparison is base (fd5e7ff) 61.99% compared to head (8f1460e) 65.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   61.99%   65.99%   +3.99%     
==========================================
  Files          39       42       +3     
  Lines        7652     8404     +752     
  Branches      829      944     +115     
==========================================
+ Hits         4744     5546     +802     
+ Misses       2596     2518      -78     
- Partials      312      340      +28     

Flag	Coverage Δ
unittests	65.99% <74.95%> (+3.99%)	⬆️

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Impacted Files	Coverage Δ
pyTMD/calc_astrol_longitudes.py	0.00% <0.00%> (-73.18%)	⬇️
pyTMD/io/ATLAS.py	41.24% <27.27%> (+0.46%)	⬆️
pyTMD/check_tide_points.py	65.15% <28.57%> (-1.52%)	⬇️
pyTMD/io/GOT.py	64.52% <30.00%> (+0.75%)	⬆️
pyTMD/io/OTIS.py	37.34% <35.00%> (+0.24%)	⬆️
pyTMD/io/FES.py	46.05% <35.29%> (+0.38%)	⬆️
pyTMD/compute_tide_corrections.py	22.48% <35.63%> (+2.76%)	⬆️
pyTMD/io/model.py	31.44% <44.96%> (+8.06%)	⬆️
pyTMD/time.py	68.96% <52.94%> (+1.30%)	⬆️
pyTMD/io/ocean_pole_tide.py	96.15% <66.66%> (+0.07%)	⬆️
... and 20 more

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