Automatically restart the language server or try to reconnect when needed

Currently, when the language server will not connect, because Godot is not launched, or because Godot was closed, there is no information to the user, and the extension will not try to reconnect automatically.

We should see if there are hooks in zed that would allow us to try to reconnect automatically.

A separate improvement would be to inform the user when the server disconnected, although I don't know if Zed currently has a provision for this.