[godot] More controls in drive mode on SpineBoneNode

[awski]

https://esotericsoftware.com/forum/d/24823-drive-mode-in-spinebonenode

While SpineBoneNode is in drive mode, the animation bone takes all transforms from controller node
if (bone_mode == SpineConstant::BoneMode_Drive) { bone->set_global_transform(this_transform); } else { set_global_transform(bone_transform); }

It would be nice enhancement to have more controls to override only rotation or position like in Unity runtime