Add ST8C

[rodrigomha]

Required for Honduras project

[codecov]

Codecov Report

Attention: Patch coverage is 95.58824% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.64%. Comparing base (a8fc069) to head (3ce7468).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/models/generated/ST8C.jl	95.58%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1181      +/-   ##
==========================================
+ Coverage   84.61%   84.64%   +0.02%     
==========================================
  Files         180      180              
  Lines        8237     8256      +19     
==========================================
+ Hits         6970     6988      +18     
- Misses       1267     1268       +1     

Flag	Coverage Δ
unittests	84.64% <95.58%> (+0.02%)	⬆️

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Files with missing lines	Coverage Δ
src/PowerSystems.jl	100.00% <ø> (ø)
src/models/generated/ST8C.jl	95.58% <95.58%> (ø)