Memory usage is not reported anywhere

[mihe]

Due to Jolt needing aligned allocations we are currently unable to use the default allocators that godot-cpp provides. This also means that Godot is unaware of any memory that gets allocated by Jolt or Godot Jolt and as such doesn't reflect it in its performance monitors.

One way to alleviate this is by adding custom performance monitors that track the memory used by Jolt.

There's a great example of this in the FMOD for Godot extension.