Add options to build `from_raw`

[kchibisov]

We should provide a way to create non-owning constructors for types that could be build from raw
pointers,like EGLSurface/EGLContext, GLXContext, ect.

[i509VCB]

Do we want a flag to indicate whether glutin takes ownership of the context/whatever?

[kchibisov]

Maybe separate methods.

[Supreeeme]

Has there been any progress towards this?

[notgull]

If you build from raw it's probably better to just wrap it in ManuallyDrop<T>