fix(to_geodataframe): add logic for implicit stress period data

[jlarsen-usgs]

• adds support for implicit stress period data that is repeated by MODFLOW but not specified by the user. Previously to_geodataframe() would crash on user provided stress periods where explicit data was not specified in the model.

[codecov]

Codecov Report

❌ Patch coverage is 60.71429% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.7%. Comparing base (556c088) to head (b506ba2).
⚠️ Report is 234 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/mf6/data/mfdatalist.py	14.2%	6 Missing ⚠️
flopy/mf6/data/mfdataplist.py	75.0%	2 Missing ⚠️
flopy/utils/rasters.py	50.0%	2 Missing ⚠️
flopy/mf6/data/mfdataarray.py	88.8%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2852      +/-   ##
===========================================
+ Coverage     55.5%    73.7%   +18.2%     
===========================================
  Files          644      659      +15     
  Lines       124135   132438    +8303     
===========================================
+ Hits         68947    97717   +28770     
+ Misses       55188    34721   -20467     

Files with missing lines	Coverage Δ
flopy/mf6/data/mfdataarray.py	62.2% <88.8%> (-4.9%)	⬇️
flopy/mf6/data/mfdataplist.py	71.5% <75.0%> (-7.3%)	⬇️
flopy/utils/rasters.py	70.0% <50.0%> (-4.0%)	⬇️
flopy/mf6/data/mfdatalist.py	64.2% <14.2%> (-5.2%)	⬇️

... and 582 files with indirect coverage changes

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