Expose existing SoftBody3D methods in editor

[LordDeatHunter]

I noticed that a lot of SoftBody3D's functionalities are not exposed in the editor.

With this PR, I exposed the already existing bounding box, as well as creating and exposing a separate method for the vertex (point) count.

With the existing point-related methods, you have to specify an index, but as far as I'm aware, there is no way of knowing if the provided index is valid (in bounds) other than running the game and checking for an error:

Index p_index = 500 is out of bounds ((int)shared->mesh_to_physics.size() = 480).
  <C++ Source>  modules\jolt_physics\objects\jolt_soft_body_3d.cpp:695 @ JoltSoftBody3D::get_vertex_position()