add addDeviceDataAsStream() from USAXS #161
Description
USAXS has a routine that simplifies adding a device data event to a named stream: https://github.com/APS-USAXS/ipython-usaxs/blob/3fb0902ae8004cfe5d2592346f0bf9ad537d20dc/profile_bluesky/startup/10-devices.py