Jd/ac power flow refactor

[jd-lara]

WIP refactoring the AC PowerFlow to support reactive power checks.

[codecov]

Codecov Report

Merging #26 (57b5171) into main (e42dd74) will decrease coverage by 0.18%.
The diff coverage is 96.05%.

❗ Current head 57b5171 differs from pull request most recent head 932f83d. Consider uploading reports for the commit 932f83d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   89.65%   89.48%   -0.18%     
==========================================
  Files           7        9       +2     
  Lines         880      894      +14     
==========================================
+ Hits          789      800      +11     
- Misses         91       94       +3     

Flag	Coverage Δ
unittests	89.48% <96.05%> (-0.18%)	⬇️

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

Files	Coverage Δ
src/PowerFlowData.jl	96.03% <100.00%> (+0.16%)	⬆️
src/PowerFlows.jl	100.00% <ø> (ø)
src/common.jl	89.74% <100.00%> (ø)
src/nlsolve_ac_powerflow.jl	90.90% <100.00%> (-5.21%)	⬇️
src/powerflow_types.jl	100.00% <100.00%> (ø)
src/solve_dc_powerflow.jl	100.00% <ø> (ø)
src/ac_power_flow_jacobian.jl	98.97% <98.97%> (ø)
src/ac_power_flow.jl	91.35% <91.35%> (ø)

[rodrigomha]

This is great.

Remaining aspects is a test for the 14bus system with enforcing q limits, and updating the system if a bus change to PQ (from PV) if a Q limit is hit.

Once the tests are ready this looks good to merge.