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Before this PR,
yjs-widgets
only supports client-side execution, where JupyterLab talks to the kernel through the kernel protocol over WebSocket. In this execution mode, widgets are created and synchronized client-side through Comms.This PR implements the rendering of widgets using server-side execution, where JupyterLab doesn't handle the kernel protocol over WebSocket, but instead uses a REST API to trigger cell execution, and reacts to notebook changes through its shared model.
It will allow to have jupyterlab-collaborative-input use
yjs-widgets
instead of using the notebook shared model as a container for the input model. An input widget is provided in this PR.