[3.9-FU] Viewport-Specific Control Panel

[sedghi]

What feature or change would you like to see made?

There is a need for a fusion UI for foreground/background, as well as for segmentation. Since we are transitioning to stack-based segmentation as the default, another viewport will not display the segmentation by default. Previously, it would show segmentation since it was volume-based frame of reference segmentation rendering. However, for stack-based rendering, it will not. Therefore, a UI is required to enable rendering segmentation on this viewport as well.

Why should we prioritize this feature?

• Fusion inside UI for rendering foreground/background
• Rendering segmentation
• In the future, changing the segmentation representation from labelmap to contour, etc.
• Rendering segmentation in 3D viewports

Requirements for Panel

• to be added

[sedghi]

Related #4163

[james-hanks]

@dan-rukas to provide concept for viewport panel then we will review and make sure all required features are added