Annotate Database of Trajectories with info from modules

Since we're propagating session_id and timestamp along the pipeline, we need to call the public annotation API from https://github.com/ami-lab/AmI-Platform/issues/180 from the following modules:
- [x] dashboard: RGB image only if it has a set session_id (which means that at the kinect-level, there is an active tracking session)
- [x] room position: synthesized position + full skeleton position (moved this task in https://github.com/ami-lab/AmI-Platform/issues/184)
- [x] head crop: cropped head
- [x] face recognition: name (this one should be set globally, on the whole session - see t = 0 case)

We also need tests for this.