Guard against work functions within the inner while loop hanging

[joshc-slac]

Current Behavior

With current behavior nodes will give a meaningful BT update unless the work function hangs, need to send kill to some "thread" to guard against this

BEAMS/beams/behavior_tree/ActionWorker.py

Lines 64 to 72 in a2c1edb

	while not completion_condition() and not work_loop_timeout_timer.is_elapsed():
	logger.debug(f"CALLING CAGET FROM from node ({name})")
	try:
	status = func(completion_condition)
	except Exception as ex:
	volatile_status.set_value(py_trees.common.Status.FAILURE)
	logger.error(f"Work function failed, setting node ({name}) "
	f"as FAILED. ({ex})")
	break

This may require launching the function as a thread with timeout...