feat: styling for 360 icons

[haakonflatval-cognite]

Type of change

Jira ticket 📘

https://cognitedata.atlassian.net/browse/UX-1560

Description 📝

Support styling of 360 icons. Especially interesting for indicating presence of annotations in the 360 image.

Currently does not play particularily well with the icon octree. Task to mitigate this is kept here: https://cognitedata.atlassian.net/browse/REV-994

How has this been tested? 🔍

In examples - in Image360Ui, adding colors to loaded entities when adding a new image collection.

Test instructions ℹ️

Checklist ☑️

• I am proud of this feature.
• I have performed a self-review of my own code.
• I have added PR type (Feat, Bug, Chore, Test, Docs, Style, Refactor) to the PR title.
• I have manually tested this for different scenarios (different models, formats, devices, browsers).
• I have commented my code in hard-to-understand areas.
• I have made corresponding changes to the public documentation.
• I have added unit and visuals tests to prove that my feature works to the best of my ability.
• I have refactored the code for readability to the best of my ability.
• I have checked that my changes do not introduce regressions in the public documentation.
• I have outlined any known defects / lacking capabilities in the contents of this PR.
• I have listed any remaining work that should follow this PR in the description or jira/miro/etc.
• I have added TSDoc to any public facing changes.
• I have added "developer documentation" in any package README.md that is related / applicable to this PR.
• I have noted down and am currently tracking any technical debt introduced in this PR.
• I have thoroughly thought about the architecture of this implementation.
• I have asked peers to test this feature.

[codecov]

Codecov Report

Merging #3757 (8c3da94) into master (298253f) will decrease coverage by 0.10%.
The diff coverage is 41.66%.

@@            Coverage Diff             @@
##           master    #3757      +/-   ##
==========================================
- Coverage   71.70%   71.61%   -0.10%     
==========================================
  Files         346      346              
  Lines       33798    33847      +49     
  Branches     2652     2653       +1     
==========================================
+ Hits        24236    24238       +2     
- Misses       9454     9501      +47     
  Partials      108      108              

Files	Coverage Δ
viewer/packages/360-images/index.ts	100.00% <100.00%> (ø)
...r/packages/360-images/src/entity/Image360Entity.ts	76.70% <100.00%> (+1.85%)	⬆️
viewer/packages/3d-overlays/src/Overlay3DIcon.ts	57.96% <100.00%> (+3.41%)	⬆️
viewer/api-entry-points/core.ts	0.00% <0.00%> (ø)
...er/packages/360-images/src/icons/IconCollection.ts	70.64% <16.66%> (-1.23%)	⬇️
viewer/packages/360-images/src/entity/Image360.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

[christjt]

Looks great! Can you add some color to one of the icons we have in the visual test?