Classroom Dashboard shared notes widget

[AlfredPichard]

Purpose

Add a new widget to the classroom dashboard to download classroom sessions shared notes.

Proposal

First, we have to find a way to access the shared notes outside of a classroom session.
One way to do so is to notice that, for each session, if a shared note is created it can be found at a link containing the internalMeetingID of this session (and some other public parameters).
However, this way of accessing a session shared note only works if the session is recorded, which is not always the case.

Another way is to process shared notes as recordings is to use the bbb pads system
https://github.com/bigbluebutton/bigbluebutton/blob/v2.6.x-release/bigbluebutton-html5/imports/api/pads/index.js

• Implement the backend shared note retrieval
• Frontend widget