Add ward reduction

[m-bossart]

No description provided.

[github-actions]

Performance Results

Version	Precompile Time
Main	2.01421879
This Branch	2.021926673

Version	Run Time
Main-Build PTDF First	5.891150414
Main-Build PTDF Second	0.091884623
Main-Build Ybus First	0.544558661
Main-Build Ybus Second	0.007478695
Main-Build LODF First	1.277482336
Main-Build LODF Second	0.357747076
This Branch-Build PTDF First	6.218981541
This Branch-Build PTDF Second	0.120947296
This Branch-Build Ybus First	0.570026024
This Branch-Build Ybus Second	0.007847048
This Branch-Build LODF First	1.245666062
This Branch-Build LODF Second	0.375424286

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.54%. Comparing base (ec72d8d) to head (8cf25c5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   77.92%   78.54%   +0.62%     
==========================================
  Files          15       15              
  Lines        1395     1445      +50     
==========================================
+ Hits         1087     1135      +48     
- Misses        308      310       +2     

Flag	Coverage Δ
unittests	78.54% <100.00%> (+0.62%)	⬆️

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

Files with missing lines	Coverage Δ
src/reduced_ybus_calculations.jl	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes