refactor: use idealized Azimuthal equidistant for Arctic models

[tsutterley]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 12 lines in your changes missing coverage. Please review.

Project coverage is 72.58%. Comparing base (bd3d702) to head (cf77302).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pyTMD/interpolate.py	25.00%	6 Missing ⚠️
pyTMD/spatial.py	73.91%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   71.65%   72.58%   +0.92%     
==========================================
  Files          39       39              
  Lines       11042    10248     -794     
  Branches     1522     1361     -161     
==========================================
- Hits         7912     7438     -474     
+ Misses       2632     2349     -283     
+ Partials      498      461      -37     

Flag	Coverage Δ
unittests	72.58% <81.81%> (+0.92%)	⬆️

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