Use anisotropic filtering to improve texture appearance at oblique angles

[Calinou]

• Depends on https://github.com/godotengine/tps-demo/pull/180.

This should only have a small performance impact on dedicated GPUs, as the bottleneck is usually not in texture sampling. On integrated GPUs, the impact is more significant but we'll need a separate preset in the long run anyway. This could ideally be automatically applied with a feature tag provided by the engine once it's implemented.

[fire]

Test Plan:

Compare a video of the performance enhancement before and after to see what changed.

[akien-mga]

Thanks!