Exit when objective is done befire timeout

[mkhansenbot]

Fixes #68

Instead of sleeping for the entire timeout duration, it sleeps for 1 second at a time and checks if the objective is done. If the objective is done, it exits. If it reaches the timeout, then it cancels the objective as before.

root@mkhansen-ThinkPad-T15-Gen-2i:/opt/moveit_studio_sdk_ws# ros2 run moveit_studio_py start_stop_async.py "3 Waypoints Pick and Place" 10
Starting 3 Waypoints Pick and Place.
Stopping 3 Waypoints Pick and Place.
Objective STOPPED by user
root@mkhansen-ThinkPad-T15-Gen-2i:/opt/moveit_studio_sdk_ws# ros2 run moveit_studio_py start_stop_async.py "Open Gripper" 10
Starting Open Gripper.
Objective executed successfully!

[mewtwoshaurd]

lgtm, ran through pre-commit so it would pass CI