Support remote language servers

[jacobdufault]

Similar to #39 and #74, it would be extremely helpful if extension language servers (ie, cquery) were run on the remote server.

I work on a large code-base at work; if this were supported, live-share could completely replace remote-desktop when WFH.

[Chuxel]

@jacobdufault Good news! That is exactly what happens. When you join a collaboration session, full intellisense is in fact run on the host's machine and in the VS Code world that is indeed done via a language server. So, if you have a giant code base, when you join the collaboration session you'll have access to the same intellisense you'd get if you ran locally. Check out language and platform support for details on what we've validated in VS Code and VS.

[jacobdufault]

Wow! I'm impressed with how well it works - great work.

Is it feasible to support custom language server messages/extensions? For example, cquery implements custom tree views?