Debugger

[davidanthoff]

JupyterLab is adding support for debugging of notebooks. As far as I can tell they are using a slightly modified version of the Debug Adapter Protocol for that, with messages being wrapped in messages from the standard Jupyter protocoll.

We are currently in the process of adding debug support to the Julia VS Code extension, which is based on the same debug protocol.

Once we have shipped the debugger in VS Code, I'll try to see how we can reuse the debug adapter protocol implementation from that code base to also support debugging in JupyterLab.

There is no TODO from this issue here for now, I just wanted to alert the folks working on IJulia that the work on a Julia debug adapter protocol implementation exists as part of the VS Code extension, and that it seems useful to try to reuse that for Jupyter as well at some point.