Fix aliasing on thin models

[OmarShehata]

For 3d models that have thin parts (think the frames around a window of a building), when you zoom out or look at them at an angle such that the line occupies a very small area of the screen, you get some very noticable artifacts in CesiumJS.

Model: lines.gltf.zip

How it looks in Blender:

Now if we look at it at an extreme angle:

CesiumJS:

BabylonJS:

ThreeJS:

I think this is because the other two engines are using MSAA to get the lines to still look decent even when they may be sub-pixel thick.

[mramato]

This is easy to see on the Cesium hot air balloon as well, just zoom out slightly while looking at the ropes holding the basket to the balloon. https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=3D%20Models.html

[OmarShehata]

Came up again on the forum here.

[OmarShehata]

Came up again in #8642.

Here's a Sandcastle reproducing essentially the same effect but on a texture. This should be easier to fix because having mipmaps for this texture could help.

[weiyinggh]

I also encountered the same problem, hope to solve it quickly, thank you!

[blueRaining]

Came up again in #8642.

Here's a Sandcastle reproducing essentially the same effect but on a texture. This should be easier to fix because having mipmaps for this texture could help.

This still looks problematic

[ggetz]

This should be fixed given MSAA has been implemented - #9900.