Generalize Layer Creator Functionality

[ppinchuk]

@mikebannis feel free to take a peek and let me know if you see any red flags (but no pressure)

This PR gets about 90% of the way toward generalizing the Layer Creator class. What is left to do is move it to a more general location and build a small CLI for it, but that can happen once we get a project that needs this kind of functionality

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.92453% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 82.68%. Comparing base (dc2d62b) to head (3cc31f6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   79.10%   82.68%   +3.58%     
==========================================
  Files         125      123       -2     
  Lines       14082    14064      -18     
==========================================
+ Hits        11139    11629     +490     
+ Misses       2943     2435     -508     

Flag	Coverage Δ
unittests	82.68% <87.92%> (+3.58%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
reVX/config/least_cost_xmission.py	90.79% <100.00%> (-0.28%)	⬇️
reVX/config/transmission_layer_creation.py	100.00% <100.00%> (ø)
reVX/least_cost_xmission/__init__.py	100.00% <ø> (ø)
reVX/least_cost_xmission/config/__init__.py	100.00% <100.00%> (ø)
reVX/least_cost_xmission/config/constants.py	100.00% <100.00%> (ø)
reVX/least_cost_xmission/layers/__init__.py	100.00% <100.00%> (ø)
reVX/least_cost_xmission/layers/base.py	94.44% <100.00%> (ø)
...eVX/least_cost_xmission/layers/dry_cost_creator.py	96.18% <100.00%> (ø)
reVX/least_cost_xmission/least_cost_paths.py	97.45% <100.00%> (ø)
reVX/least_cost_xmission/least_cost_paths_cli.py	70.40% <100.00%> (ø)
... and 10 more

... and 6 files with indirect coverage changes

[mikebannis]

Generally looks good, left a couple minor comments.

[ppinchuk]

Thanks for the review @mikebannis - these were exactly the kinds of things I wanted to catch :)