CollisionGroups activation at runtime

[DennisSmolek]

At the moment there is no way to change a bodies CollisionGroup at runtime. The method exists on the C++ version but hasn't been ported to Jolt yet.
I'm too lazy to do yet another local build of it for this feature.

I'm writing the inital setup to only work correctly if the group value is set during body creation, that way it will use the group with the correct filtering setup.

Once the SetCollisionGroup is live on main Jolt we can add it back here.