Feat(hfb_util): add method for creating HFBs

[jlarsen-usgs]

• added make_hfb_array which supports HFB data creation from LineString / Grid intersections for all FloPy Grid types
• added additional updates to support HFB creation development including
  • Grid: add cell_area property via the shoelace algorithm
  • GridIntersect: add "experimental" support for UnstructuredGrid
  • VoronoiGrid: add support for get_disu6_gridprops() that can build MF6 DISU packages

[codecov]

Codecov Report

❌ Patch coverage is 92.13483% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.5%. Comparing base (556c088) to head (3c4e190).
⚠️ Report is 150 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/utils/hfb_util.py	89.3%	20 Missing ⚠️
flopy/utils/gridintersect.py	87.5%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2745      +/-   ##
===========================================
+ Coverage     55.5%    72.5%   +17.0%     
===========================================
  Files          644      676      +32     
  Lines       124135   131196    +7061     
===========================================
+ Hits         68947    95218   +26271     
+ Misses       55188    35978   -19210     

Files with missing lines	Coverage Δ
flopy/discretization/grid.py	74.8% <100.0%> (-1.2%)	⬇️
flopy/utils/__init__.py	100.0% <100.0%> (ø)
flopy/utils/voronoi.py	81.6% <100.0%> (+12.2%)	⬆️
flopy/utils/gridintersect.py	72.5% <87.5%> (-7.0%)	⬇️
flopy/utils/hfb_util.py	89.3% <89.3%> (ø)

... and 571 files with indirect coverage changes

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