add action for new gripper controller

Signed-off-by: Paul Gesel <[email protected]>

control_msgs/action/AntipodalGripperCommand.action

@@ -0,0 +1,11 @@
+sensor_msgs/JointState command # The velocity and effort fields are optionally and not used if empty.
+---
+float64 position  # The current gripper gap size (in meters)
+float64 effort    # The current effort exerted (in Newtons)
+bool stalled      # True iff the gripper is exerting max effort and not moving
+bool reached_goal # True iff the gripper position has reached the commanded setpoint
+---
+float64 position  # The current gripper gap size (in meters)
+float64 effort    # The current effort exerted (in Newtons)
+bool stalled      # True iff the gripper is exerting max effort and not moving
+bool reached_goal # True iff the gripper position has reached the commanded setpoint