Consider to not throw invalid_argument exceptions

Right now, there are few places where an `invalid_argument` exception can be thrown:

- In the `Plane` constructor, when the given normal is not normalized ( https://github.com/CesiumGS/cesium-native/blob/8a2957d32f433438b6b91ad37059c1ca0c8665c5/CesiumGeometry/src/Plane.cpp#L13 )
- In the `Ray` constructor, when the ray direction is not normalized ( https://github.com/CesiumGS/cesium-native/blob/8a2957d32f433438b6b91ad37059c1ca0c8665c5/CesiumGeometry/src/Ray.cpp#L13 )
- In the `EllipsoidTangentPlane` class, when the origin is near the center ( https://github.com/CesiumGS/cesium-native/blob/b824699d3dd9503a5943007247f683b6adc132d4/CesiumGeospatial/src/EllipsoidTangentPlane.cpp#L51 )

As much as I'm a fan of early, clear error checks and responses, we should consider handling this differently: Recent crashes in Unreal ( https://github.com/CesiumGS/cesium-unreal/issues/290 and https://github.com/CesiumGS/cesium-unreal/issues/336 ) have been caused by this, and these crashes are hard, painful, and non-recoverable.

I'm not sure about the best solution for this.

- Simple solutions (like filling stuff with `NaN` or so) are certainly not appropriate, becauses these will have the effect of "Nothing is rendered", **without** any clue of what's happening at all.
- Enforcing to wrap the creation of these objects into `try-catch` will be hard (and inconvenient)
- More strict, invasive solutions could be (brainstorming) to make the constructors of these classes `private`, and only allow them to be created with factory methods that return an `std::optional`. We could also consider separate `createThrowing`/`createUncheckedWithNaN`/`createOptional` factory methods.

I just did a websearch about what e.g. GLM does for a `normalize` call on zero-length vectors, but... surprisingly there is no obvious information for that (have to try it out, I guess). The point is that we should consider "following conventions" for such cases ... if there *are* conventions. Otherwise, it largely depends on the desired and expected behavior, and the crucial question of "What should happen when the precondition does not hold?".