Add holes and stRotation to coplanar polygon

[hpinkos]

As much as I didn't want to do this, as soon as I looked at wiring up CoplanarPolygonGeometry to the entity layer it was very obvious that I should make CoplanaryPolygonGeometry supported features mirror what we do in PolygonGeometry.

• Added support for holes using a PolygonHierarchy
• Added stRotation option (You were right @ggetz =P)

[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.

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[hpinkos]

@bagnell can you review please?

[bagnell]

👍

[Alegriabaile]

Hi, hpinkos. Thanks for provide the CoplanarPolygonGeometry && CoplanarPolygonOutlineGeometry interface, it really helps!

[Alegriabaile]

If anyone wants a demo of CoplanarPolygonOutlineGeometry, here is how I found:
I tried to find a demo of CoplanarPolygonOutlineGeometry with google but failed. I tried create the outline like PolygonOutlineGeometry/CoplanarPolygonGeometry but still failed. By the way, I found the description of the constructor of CoplanarPolygonOutlineGeometry is outdated.
At last, I found the demo【Sandcastle/gallery/development/Coplanar Polygon Outline.html】 and applied CoplanarPolygonOutlineGeometry to the project.