Remote SSH: Support RemoteForward in Fowarded Ports view

Description

VSCode currently only displays Remote SSH port forwards in one direction (LocalForward or ssh -L). Please consider adding support for RemoteForward or ssh -R.

Use case

I've recently started using this in order to develop with the Flutter framework remotely over SSH with the Android emulator running on my local machine and the Flutter SDK and VS Code extension running on the remote.

This is possible by running adb tcpip 5555 on your local machine (with an Android emulator running or phone plugged in via USB). You can then forward the ADB port (ssh -R 5555 127.0.0.1:5555) to the remote, run adb connect 127.0.0.1:5555 and VS Code picks up the device perfectly.

See example ~/.ssh/config below:

Host myhost
    HostName        x.x.x.x
    LocalForward    8000 127.0.0.1:8000
    LocalForward    1433 127.0.0.1:1433
    RemoteForward   5555 127.0.0.1:5555

How it looks now: