fix(MFPackage kwargs check): Now verifying that only valid kwargs are passed to MFPackage

[spaulins-usgs]

No description provided.

[codecov]

Codecov Report

Merging #1667 (c246158) into develop (89fc16b) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           develop   #1667   +/-   ##
=======================================
  Coverage     71.6%   71.6%           
=======================================
  Files          253     253           
  Lines        55724   55735   +11     
=======================================
+ Hits         39922   39935   +13     
+ Misses       15802   15800    -2     

Impacted Files	Coverage Δ
flopy/mf6/mfpackage.py	65.4% <100.0%> (+0.6%)	⬆️
flopy/utils/gridintersect.py	76.2% <0.0%> (-2.8%)	⬇️
flopy/utils/get_modflow.py	63.9% <0.0%> (-1.5%)	⬇️
flopy/mf6/mfmodel.py	57.5% <0.0%> (+0.3%)	⬆️
flopy/mf6/mfbase.py	81.2% <0.0%> (+1.6%)	⬆️
flopy/mf6/modflow/mfsimulation.py	61.8% <0.0%> (+2.1%)	⬆️