gimbal: move gimbal controls to new dedicated topic

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

msg/CMakeLists.txt

@@ -99,6 +99,7 @@ set(msg_files
 	GimbalManagerStatus.msg
 	GpsDump.msg
 	GpsInjectData.msg
+	GimbalControls.msg
 	Gripper.msg
 	HealthReport.msg
 	HeaterStatus.msg

msg/GimbalControls.msg

@@ -0,0 +1,9 @@
+uint64 timestamp			# time since system start (microseconds)
+uint8 INDEX_ROLL = 0
+uint8 INDEX_PITCH = 1
+uint8 INDEX_YAW = 2
+
+uint64 timestamp_sample	    # the timestamp the data this control response is based on was sampled
+float32[3] control
+
+float32 retract_gimbal