Add SlicerMultiverSeg extension

[SebGoll]

New extension

Tier 1

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Tier 3

Community-supported extensions.

• Extension has a reasonable name (not too general, not too narrow, suggests what the extension is for)
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• Follows programming and user interface conventions of 3D Slicer (e.g., GUI and logic are separated, usage of popups is minimized, no unnecessary custom GUI styling, etc.)
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• Maintainers respond to questions directly addressed to him/her via @mention on the Slicer Forum.
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• All requirements of tiers < 3.

[SebGoll]

Hi @pieper and @lassoan, I was told this might be of interest to you. It's a follow-up from the NA-MIC Project Week, making @halleewong's MultiverSeg model available as a segment editor effect. (Source: https://github.com/dalcalab/SlicerMultiverSeg)

[lassoan]

This looks great, thank you! I'll be able to review this early next week. Maybe @pieper can have a first look until then.