f64 support

[Aceeri]

Allows usage of rapier3d/2d-f64 with bevy rapier.

[sebcrozet]

Thank you for this PR!
What is the use-case for this? While the internal calculation will be performed with f64 precision, the synchronization with bevy’s transform will still rely on f32, resulting in an automatic loss of precision for all the positions.

[Aceeri]

Thank you for this PR! What is the use-case for this? While the internal calculation will be performed with f64 precision, the synchronization with bevy’s transform will still rely on f32, resulting in an automatic loss of precision for all the positions.

Mostly for better substep precision, but I also hope to improve this by adding a PhysicsTransform instead of us using GlobalTransform directly.