Add edge reaction term to implement joule heat

[j-fu]

No description provided.

[codecov-commenter]

Codecov Report

Base: 87.33% // Head: 87.44% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (dec9e20) compared to base (7446c8e).
Patch coverage: 64.28% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
+ Coverage   87.33%   87.44%   +0.10%     
==========================================
  Files          20       20              
  Lines        2329     2341      +12     
==========================================
+ Hits         2034     2047      +13     
+ Misses        295      294       -1     

Impacted Files	Coverage Δ
src/vfvm_testfunctions.jl	97.02% <64.28%> (-2.98%)	⬇️
src/vfvm_impedance.jl	95.96% <0.00%> (-0.81%)	⬇️
src/vfvm_system.jl	87.76% <0.00%> (-0.43%)	⬇️
src/vfvm_solver.jl	86.03% <0.00%> (+0.34%)	⬆️
src/vfvm_geometryitems.jl	89.93% <0.00%> (+4.69%)	⬆️

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