Update Node Debugging Experience

[tsmaeder]

Is your enhancement related to a problem? Please describe.

The Debugging experience for Node seems to be much better in VS Code than what we have in Che right now. For example, when debugging the Theia back-end process, breakpoints in subprocesses (the plugin host process in particular) are hit, as well. I also feel the performance is better in VS Code.

Describe the solution you'd like

Let's investigate where we have gaps: in particular update the node-debug/node-debug2 extensions to a newer level and identify gaps in API or what we need to improve in the debugger implementation in Theia.

Describe alternatives you've considered

Additional context

[tsmaeder]

For starters, vs code now uses "jd-debug" for javascript debugging: https://github.com/microsoft/vscode-js-debug. To quote, "It has been the default JavaScript debugger in Visual Studio Code since 1.46".
We're still using node-debug and node-debug2 in Che.

[tsmaeder]

Also, Theia is a bit behind on the Debugger API, in particular, it does not group debug sessions in a parent hierarchy.

[tsmaeder]

I filed eclipse-theia/theia#9664, we're also quite behind on the DAP implementation: eclipse-theia/theia#8136

[svor]

jsdebug configuration was added for nodejs and nodejs+mongoDB devfiles v2