feat: setup three winding trafo visualisation

[jaapschoutenalliander]

Draft for visualisation of three winding transformers

Choices to discus:

• The three winding transformer is visualized by 3-connections between the nodes. Could also be done using a helper node. However, the current choice is based on the internal graph modelling choice
• Did not add a new visualization style for 3-winding-transformer but visualized as transformer (blue lines)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Thijss]

Nice feature! Looks good to me 👍.
We could optionally consider using a different color, but I think blue makes sense.
Downside of extra color: we also have to extend the legend again

[jaapschoutenalliander]

Nice feature! Looks good to me 👍. We could optionally consider using a different color, but I think blue makes sense. Downside of extra color: we also have to extend the legend again

Agree with the color, had the same consideration. For now I'll keep it blue so to keep the legend clean