px4_work_queue: command line status output and shutdown empty queues

* adds a work_queue systemcmd that will bring a tree view of all active work queues and work items
 * WorkQueues now track attached WorkItems and will shutdown when the last WorkItem is detached

src/drivers/osd/atxxxx/atxxxx.cpp

@@ -49,7 +49,7 @@ static constexpr uint32_t OSD_UPDATE_RATE{500_ms};	// 2 Hz
 OSDatxxxx::OSDatxxxx(int bus) :
 	SPI("OSD", nullptr, bus, PX4_MK_SPI_SEL(bus, OSD_SPIDEV), SPIDEV_MODE0, OSD_SPI_BUS_SPEED),
 	ModuleParams(nullptr),
-	ScheduledWorkItem(px4::device_bus_to_wq(get_device_id()))
+	ScheduledWorkItem(MODULE_NAME, px4::device_bus_to_wq(get_device_id()))
 {
 }