[ws-proxy] SSH gateway support full channel type

[iQQBot]

Description

Before, we introduce SSH Gateway, however, it only supports a few ssh channels, such as session, direct-tcpip
This prevents the use of other channels such as remote port forwarding
This PR add full channel support

Related Issue(s)

Fixes #10248
Fixes #6993

How to test

1. start a workspace
2. check everything is normal as before (vscode desktop, Jetbrains, copy/paste ssh command....)
3. test remote port forward

example:
in local machine

ssh -vNR 8080:ipinfo.io:80 workspaceId#ownerToken@workspaceUrl

open workspace in vscode browser, run

lsof -i:8080 # you will see sshd is listen this port
curl https://localhost:8080 # you will see an IP address, this IP address is your local machine public IP address

Release Notes

SSH Gateway support remote port forward

Documentation

[akosyakov]

@iQQBot Could we also collect analytics what kind of channels users are using? It can be another the PR against this one. Some new event like ssh_connection_channel? We also don't need to collect duplicates, i.e. register only once per a session. Feasible?

[iQQBot]

Could we also collect analytics what kind of channels users are using? It can be another the PR against this one. Some new event like ssh_connection_channel? We also don't need to collect duplicates, i.e. register only once per a session. Feasible?

Ok

[mustard-mh]

For Jetbrains

For copy/paste ssh command

For vscode using local-app

For vscode using ssh gateway

also test remote port forward, it can connect to mysql through my local computer

works like a charm! 🎉