Feat(dis_properties): add grid method to get discretization properties

[jlarsen-usgs]

• returns dictionary of keyword arguments to build DIS, DISV, or DISU depending on grid
• added cell .area calculation via shoelace algorithm to grids

[jlarsen-usgs]

#2388

[codecov]

Codecov Report

❌ Patch coverage is 55.10204% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.3%. Comparing base (556c088) to head (2b1778c).
⚠️ Report is 121 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/discretization/unstructuredgrid.py	57.1%	9 Missing ⚠️
flopy/discretization/grid.py	20.0%	8 Missing ⚠️
flopy/discretization/structuredgrid.py	66.6%	4 Missing ⚠️
flopy/discretization/vertexgrid.py	83.3%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2700      +/-   ##
===========================================
+ Coverage     55.5%    72.3%   +16.8%     
===========================================
  Files          644      667      +23     
  Lines       124135   130548    +6413     
===========================================
+ Hits         68947    94467   +25520     
+ Misses       55188    36081   -19107     

Files with missing lines	Coverage Δ
flopy/discretization/vertexgrid.py	80.1% <83.3%> (-3.6%)	⬇️
flopy/discretization/structuredgrid.py	53.9% <66.6%> (+6.5%)	⬆️
flopy/discretization/grid.py	73.6% <20.0%> (-2.4%)	⬇️
flopy/discretization/unstructuredgrid.py	80.1% <57.1%> (-1.3%)	⬇️

... and 559 files with indirect coverage changes

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