feat: add JSON definition file parsing for #310

[tsutterley]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.72043% with 51 lines in your changes missing coverage. Please review.

Project coverage is 69.55%. Comparing base (76a288a) to head (e306a27).
Report is 6 commits behind head on main.

Files	Patch %	Lines
pyTMD/io/model.py	63.96%	31 Missing and 9 partials ⚠️
test/test_model.py	93.45%	3 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
+ Coverage   69.34%   69.55%   +0.20%     
==========================================
  Files          39       39              
  Lines        8844     9137     +293     
  Branches     1195     1271      +76     
==========================================
+ Hits         6133     6355     +222     
- Misses       2325     2382      +57     
- Partials      386      400      +14     

Flag	Coverage Δ
unittests	69.55% <81.72%> (+0.20%)	⬆️

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