Add axial, coronal, sagittal (or similar) annotations to big axes

[andreasbueckle]

Zorina and Tyler suggested to add axial, coronal, sagittal annotations to the 3D scene in the spatial search (could be extended to RUI as well). We received this feedback multiple times as user want to see the larger anatomy represented as outside-of-the-organ landmarks:

[andreasbueckle]

Notes from 7/20 meeting between @bherr2 and me: We can work this issue into a RUI refresh in 9/2022 with a focus on improving spatial orientation for the user. We discussed 6 possible adjustments that we can test with a Unity prototype. @libby-maier and @andreasbueckle could run a user study.

Ideas:

• Add big 3D axes in background (like in spatial search)
• Add carbon rods to tissue block, see https://github.com/hubmapconsortium/ccf-ui/issues/541
• Add color-coded planes to mannequin/gizmo on side, see above. Replace gizmo with VHF/VHM skin
• Add bright marker of organ inside mannequin for additional spatial context while avoiding overload
• Add color-coded keys to UI that are highlighted on user input (like in spatial search)
• Add labels (sagittal, transverse, coronal) to rotation sliders.

[andreasbueckle]

Gizmo/mannequin mesh: https://github.com/hubmapconsortium/ccf-3d-reference-object-library/tree/main/Assets