Add Lossy Multi-Terminal HVDC models

[rodrigomha]

To do:

• Create converter variables
• Create DC network variables
• Create converter constraints
• Create DC network constraints
• Test basic model

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 158 lines in your changes missing coverage. Please review.

Project coverage is 76.49%. Comparing base (303c2d9) to head (c00394c).
Report is 4 commits behind head on rhjd/add_ipc_models.

Files	Patch %	Lines
src/devices_models/devices/HVDCsystems.jl	0.00%	118 Missing ⚠️
...els/device_constructors/hvdcsystems_constructor.jl	0.00%	39 Missing ⚠️
src/core/expressions.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           rhjd/add_ipc_models    #1128      +/-   ##
=======================================================
- Coverage                77.44%   76.49%   -0.96%     
=======================================================
  Files                      118      118              
  Lines                    12658    12816     +158     
=======================================================
  Hits                      9803     9803              
- Misses                    2855     3013     +158     

Flag	Coverage Δ
unittests	76.49% <0.00%> (-0.96%)	⬇️

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

Files	Coverage Δ
src/PowerSimulations.jl	100.00% <ø> (ø)
src/core/auxiliary_variables.jl	75.00% <ø> (ø)
src/core/constraints.jl	100.00% <ø> (ø)
src/core/formulations.jl	96.87% <ø> (ø)
src/core/variables.jl	62.90% <ø> (ø)
src/core/expressions.jl	71.42% <0.00%> (-5.50%)	⬇️
...els/device_constructors/hvdcsystems_constructor.jl	32.20% <0.00%> (-62.80%)	⬇️
src/devices_models/devices/HVDCsystems.jl	29.38% <0.00%> (-27.31%)	⬇️

[github-actions]

Performance Results

Version	Precompile Time
Main	3.201761272
This Branch	3.304719633

Version	Build Time
Main-Build Time Precompile	50.230389764
Main-Build Time Postcompile	1.074673636
This Branch-Build Time Precompile	51.130797244
This Branch-Build Time Postcompile	1.218703992

Version	Build Time
Main-Solve Time Precompile	1688.296680561
Main-Solve Time Postcompile	1669.603077788
This Branch-Solve Time Precompile	529.018100733
This Branch-Solve Time Postcompile	500.058935896