feat: added new Gr1km-v2 1km Greenland model from ESR

[tsutterley]

feat: added 3413 projection for new 1km Greenland model from ESR

fix: tidal currents for bilinear interpolation to address part of #57

fix: add warning for tide models being entered as string to address #58

docs: update documentation for new model

[codecov]

Codecov Report

Merging #59 (cbe73d8) into main (1ad610e) will decrease coverage by 0.36%.
The diff coverage is 35.00%.

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
- Coverage   76.46%   76.09%   -0.37%     
==========================================
  Files          47       47              
  Lines        4741     4778      +37     
  Branches      474      480       +6     
==========================================
+ Hits         3625     3636      +11     
- Misses        944      965      +21     
- Partials      172      177       +5     

Flag	Coverage Δ
unittests	76.09% <35.00%> (-0.37%)	⬇️

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Impacted Files	Coverage Δ
pyTMD/compute_tide_corrections.py	31.14% <20.00%> (-0.83%)	⬇️
pyTMD/convert_ll_xy.py	80.51% <20.00%> (-9.04%)	⬇️
pyTMD/read_FES_model.py	43.54% <25.00%> (-0.62%)	⬇️
pyTMD/read_GOT_model.py	95.04% <25.00%> (-2.40%)	⬇️
pyTMD/read_netcdf_model.py	54.97% <25.00%> (-0.65%)	⬇️
pyTMD/read_tide_model.py	39.54% <85.71%> (+0.69%)	⬆️
test/test_download_and_read.py	99.73% <100.00%> (ø)
pyTMD/utilities.py	71.53% <0.00%> (-0.39%)	⬇️

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