SAR-276 Expose the queue manager in the SkaBaseDevice

docs/source/api/queue_manager.rst

pogo/CspSubElementController.xmi

pogo/CspSubElementObsDevice.xmi

pogo/CspSubElementSubarray.xmi

pogo/SKAAlarmHandler.xmi

pogo/SKABaseDevice.xmi

pogo/SKACapability.xmi

pogo/SKAController.xmi

pogo/SKALogger.xmi

pogo/SKAObsDevice.xmi

pogo/SKASubarray.xmi

pogo/SKATelState.xmi

src/ska_tango_base/base/base_device.py

src/ska_tango_base/base/component_manager.py

src/ska_tango_base/base/reference_component_manager.py

src/ska_tango_base/base/task_queue_manager.py

src/ska_tango_base/commands.py

src/ska_tango_base/utils.py

tests/long_running_tasks/conftest.py

tests/long_running_tasks/reference_base_device.py