update(convert_grid): added offset and angrot info to conversion

[jlarsen-usgs]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d0c5dbc) 73.0% compared to head (4a87400) 73.0%.
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2083   +/-   ##
=======================================
  Coverage     73.0%   73.0%           
=======================================
  Files          259     259           
  Lines        59329   59329           
=======================================
+ Hits         43316   43331   +15     
+ Misses       16013   15998   -15     

Files	Coverage Δ
flopy/discretization/structuredgrid.py	47.6% <ø> (ø)
flopy/discretization/unstructuredgrid.py	85.4% <ø> (ø)
flopy/discretization/vertexgrid.py	83.5% <ø> (ø)
flopy/plot/plotutil.py	55.2% <ø> (ø)

... and 6 files with indirect coverage changes