feat: functions to read and interpolate from all constituents to address #91

[tsutterley]

test: switch interpolation test to soft tabs
to do: need to see if these are actual optimizations

[codecov]

Codecov Report

Base: 64.80% // Head: 63.81% // Decreases project coverage by -0.98% ⚠️

Coverage data is based on head (cf907e1) compared to base (501d1ab).
Patch coverage: 59.80% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
- Coverage   64.80%   63.81%   -0.99%     
==========================================
  Files          44       53       +9     
  Lines        6316     7423    +1107     
  Branches      638      769     +131     
==========================================
+ Hits         4093     4737     +644     
- Misses       1998     2379     +381     
- Partials      225      307      +82     

Flag	Coverage Δ
unittests	63.81% <59.80%> (-0.99%)	⬇️

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

Impacted Files	Coverage Δ
pyTMD/calc_astrol_longitudes.py	72.50% <ø> (ø)
pyTMD/load_constituent.py	88.88% <ø> (ø)
pyTMD/load_nodal_corrections.py	98.75% <ø> (ø)
pyTMD/read_tide_model.py	26.43% <1.85%> (-11.67%)	⬇️
pyTMD/read_netcdf_model.py	27.90% <4.76%> (-26.02%)	⬇️
pyTMD/read_GOT_model.py	33.33% <6.66%> (-57.04%)	⬇️
pyTMD/read_FES_model.py	30.00% <10.00%> (-16.31%)	⬇️
pyTMD/calc_delta_time.py	57.14% <25.00%> (-42.86%)	⬇️
pyTMD/iers_mean_pole.py	43.75% <25.00%> (-37.39%)	⬇️
pyTMD/infer_minor_corrections.py	33.33% <25.00%> (-63.70%)	⬇️
... and 41 more

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