ModelInstanceCollection 2D Scene support

[lukemckinstry]

Description

Builds off #12588, adds support for Scene2D and Columbus View

ToDo:

• local transforms (ie. wrong orientation for instances at correct location) for earth centered model
• Columbius View model scaling issue
• Precompute values / performance
• Improve clarity on "2D" variable and functions in code comments
• glTF with top level components transform (earth centered) components.transform is just used for i3dm tilesets
• tests for ModelDrawCommands createCommandModelMatrix and createCommandBoundingSphere
• check effects when switching sceneMode when zoomed all the way out in 2D mode, it looks like instances close together are impacted by z-fighting
• Unify code paths for earth-centered and non-earth-centered models
  • combine 3D modelMatrix & instance transform, calculate 2D transform, then remove modelMatrix
• This feature is good to add to release regression tests (3D, 2D, CV) because it is clear to test and tell when something is broken

Issue number and link

#10846

Testing plan

• Instanced model centered on earth origin - link
• Instanced model centered at arbitrary location - link
  • Earth surface with small transforms
  • larger transforms
• Columbus view

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have updated the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @lukemckinstry!

✅ We can confirm we have a CLA on file for you.