Support for vertical polygons

[hpinkos]

Fixes #3349

We can now render this crazy KML file:

I connected CoplanarPolygonGeometry to the Entity API.
We use it instead of PolygonGeometry when perPositionHeight: true and extrudedHeight: undefined.

TODO

• Merge Add holes and stRotation to coplanar polygon #6787
• Update CHANGES

[cesium-concierge]

Thanks for the pull request @hpinkos!

• ✔️ Signed CLA found.
• ❔ CHANGES.md was not updated.
  • If this change updates the public API in any way, please add a bullet point to CHANGES.md.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.
• Works (or fails gracefully) in IE11.

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[mramato]

Update CHANGES and specifically mention that this improves KML compatibility.

[hpinkos]

@mramato this is ready now

[mramato]

This name needs to be updated.

[mramato]

Can we add a test for this? The rest of the updater is pretty well covered by tests I believe.

[mramato]

Looks great @hpinkos, just those couple of comments.

[hpinkos]

@mramato ready

[mramato]

Thanks @hpinkos!

[silky]

thanks for adding this @hpinkos !