adds tie and hvdc lines to the map-viewer widget

[CBiasuzzi]

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• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
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Does this PR already have an issue describing the problem?

What kind of change does this PR introduce?

feature

What is the current behavior?

What is the new behavior (if this is a feature change)?
displays network's tie lines and HVDC lines in the mapviewer widget

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

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What changes might users need to make in their application due to this PR? (migration steps)

Other information:

[flo-dup]

Currently in powybl-iidm-impl

• there cannot be a linePosition extension on HVDC lines
• there cannot be a linePosition extension on tielines, the positions are expected on the dangling lines

Hence,

• there cannot be with current powsybl-iidm-impl state the detailed line for HVDC lines (always straight lines between corresponding substations) as the data is not in iidm extensions
• for tielines we could display the detailed line though, but we need to look for extensions on the dangling lines, I'll write an issue about that
• and for unpaired dangling lines we could also display it, but that's a separated feature (the widget does not handle a line with no substation on one side, and not sure the viewer handles it either)