Add support for `is<T>`

[PathogenDavid]

PxBase has a template method named is<T> which can be used to identify the subtype of a PxBase object at runtime. It's not super commonly used, but it does come up every once and a while. It is currently untranslated because it's a template method.

Generally you can get a similar check using getConcreteType, but that only works if you know the specific type you're looking for. It does not work well when you want the ability to identify collection of types. (IE: PxRigidActor, which has multiple concrete variants PxRigidStatic, PxRigidDynamic, and PxAtriculationLink.) Doing a check similar to this requires using isKindOf, which is currently not translated as it is protected.

In theory we could use Biohazrd's template specialization to generate many is_Blah implementations, but I don't think that's a user-friendly approach here. We should instead implement our own variant of it using C# generics.

This also means we need to implement an equivalent of PxTypeInfo (also currently untranslated.) The C++ approach does not make sense for C# here. We should instead either A) use the default(T)+property trick we used in Mochi.DirectX for interface IIDs or B) use static abstract interfaces.

A is in theory slightly worse for performance, but B requires the use of preview features prior to .NET 7.