Implement production vertical slice foundation

game/application/interfaces/vehicle_motion_port.gd

@@ -0,0 +1,8 @@
+class_name VehicleMotionPort
+extends RefCounted
+
+const VehicleCommand = preload("res://game/application/vehicle/vehicle_command.gd")
+
+
+func apply_command(_command: VehicleCommand) -> void:
+	pass