Support tiling vector data into 3D Tiles

Moving this issue from here

Adding support tiling vector data into 3D Tiles on Cesium ion is on our roadmap. This would allow you to visualize large amounts of vector in 3D, with clamping on terrain, by loading higher levels of detail based on the current camera view, in the same way that 3D Tiles allows you to do this for massive point clouds, 3D models etc.

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