Added TrackingReferenceFrame.ENU

[jfayot]

Description

Follows-up #12194 .
Added TrackingReferenceFrame.ENU to allow tracking entities in their local East-North-Up reference frame.

Issue number and link

Fixes #12313

Testing plan

• Updated EntityViewSpec.js
• Updated Entity Tracking sandcastle
• Tested sandcastle provided in Tracked Entity Orientation Flip #12313 with entity's trackingReferenceFrame set to ENU.

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, @jfayot!

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

[ggetz]

Thanks for the additional PR @jfayot! Glad to hear this is working for #12313.

The code overall is looking great! Could we please note the additional fix in CHANGES.md? It night help give context to users with similar issues.

[jfayot]

@ggetz , I've updated the CHANGES.md file with the possible values that can take Entity.trackingReferenceFrameand a note on possible camera orientation flip when auto-detect algorithm is used.
That made me think that another tracking reference frame could be proposed: VVLH, which is only available through AUTODETECT right now.
What do you think?

[ggetz]

@jfayot That works! I think after that, all options are covered.

[jfayot]

@ggetz I realized that I got ahead of myself while proposing this TrackingReferenceFrame.VVLH: if TrackingReferenceFrame.ENU makes sense, it's because you can define ENU at any point whatever the dynamic of the entity is. However it goes differently for VVLH, this kind of reference frame cannot be defined at any condition! I guess this explains the reason for auto-detect: ENU acts as a fallback where VVLH cannot be defined.
But a pure VVLH makes no sense...

[ggetz]

Got it. The rest of the changes are all looking good. Thanks @jfayot!