Add support for opening Terminal window in right pane

[prabirshrestha]

Currently zed supports opening terminal in split down and new full screen tab.

  {
    "context": "Workspace",
    "bindings": {
      "ctrl-a c": "workspace::NewCenterTerminal",
      "ctrl-a -": "workspace::NewTerminal"
    }
  },

It doesn't support opening a new terminal on the right pane.

I want to mimic tmux behavior for ctrl-a \\ to open in right pane. Is it possible to have something like workspace::NewRightTerminal.

This binding also doesn't seem to work. "ctrl-a \\": "workspace::NewTerminal" where \ is not recognized to open new terminal