msg ROS2 compatibility, microdds_client improvements (timesync, reduced code size, added topics, etc), fastrtps purge

- update all msgs to be directly compatible with ROS2
 - microdds_client improvements
   - timesync
   - reduced code size
   - add to most default builds if we can afford it
   - lots of other little changes
 - purge fastrtps (I tried to save this multiple times, but kept hitting roadblocks)

msg/ControlAllocatorStatus.msg

@@ -0,0 +1,23 @@
+uint64 timestamp                        # time since system start (microseconds)
+
+bool torque_setpoint_achieved           # Boolean indicating whether the 3D torque setpoint was correctly allocated to actuators. 0 if not achieved, 1 if achieved.
+float32[3] allocated_torque             # Torque allocated to actuators. Equal to `vehicle_torque_setpoint_s::xyz` if the setpoint was achieved.
+float32[3] unallocated_torque           # Unallocated torque. Equal to 0 if the setpoint was achieved.
+                                        # Computed as: unallocated_torque = torque_setpoint - allocated_torque
+
+bool thrust_setpoint_achieved           # Boolean indicating whether the 3D thrust setpoint was correctly allocated to actuators. 0 if not achieved, 1 if achieved.
+float32[3] allocated_thrust             # Thrust allocated to actuators. Equal to `vehicle_thrust_setpoint_s::xyz` if the setpoint was achieved.
+float32[3] unallocated_thrust           # Unallocated thrust. Equal to 0 if the setpoint was achieved.
+                                        # Computed as: unallocated_thrust = thrust_setpoint - allocated_thrust
+
+int8 ACTUATOR_SATURATION_OK        =  0 # The actuator is not saturated
+int8 ACTUATOR_SATURATION_UPPER_DYN =  1 # The actuator is saturated (with a value <= the desired value) because it cannot increase its value faster
+int8 ACTUATOR_SATURATION_UPPER     =  2 # The actuator is saturated (with a value <= the desired value) because it has reached its maximum value
+int8 ACTUATOR_SATURATION_LOWER_DYN = -1 # The actuator is saturated (with a value >= the desired value) because it cannot decrease its value faster
+int8 ACTUATOR_SATURATION_LOWER     = -2 # The actuator is saturated (with a value >= the desired value) because it has reached its minimum value
+
+int8[16] actuator_saturation            # Indicates actuator saturation status.
+                                        # Note 1: actuator saturation does not necessarily imply that the thrust setpoint or the torque setpoint were not achieved.
+                                        # Note 2: an actuator with limited dynamics can be indicated as upper-saturated even if it as not reached its maximum value.
+
+uint16 handled_motor_failure_mask        # Bitmask of failed motors that were removed from the allocation / effectiveness matrix. Not necessarily identical to the report from FailureDetector