Build the tasks command API (.gitpod.yml) into JetBrains integration

[loujaybee]

In Gitpod a user can specify tasks which are shell scripts executed on workspace container startup. We would like to allow users to interact with their terminal using the commands they specific in their tasks command them from within the thin client. In VS Code we are using pseudo terminal API allowing to connect tasks.

See: Internal link

[loujaybee]

This will require some investigation, and discussions with JetBrains. @akosyakov can help here.

[felladrin]

I started looking into it today and will leave here some notes as reminders for later:

On jetbrains/backend-plugin, we should mimic what we're doing on openvscode-server's registerTask method (see usage example). For this, we need to use JB's TerminalView (which is part of the built-in plugin Terminal) and the TerminalServiceGrpc.

[felladrin]

@loujaybee, do you think we can close this, now that #9443 has been merged?

[akosyakov]

yes, let's close it