Add Get-EditorCommand and $psEditor.GetEditorCommand()

The way it is currently setup, it can be very difficult to determine what the Editor Command Names are that are loaded. The user is only shown the Display Name, so they will actually have to go look at the source code of the Register-EditorCommand to get the name.

This makes it difficult to unregister Editor Commands if you do not already know exactly what the command's name is. This will become more problematic once people start integrating their commands into modules.

Inizia tracciando il flusso esistente di Register-EditorCommand e il modo in cui vengono attualmente visualizzati i comandi dell'editor caricati. La modifica è completa quando gli utenti possono individuare i nomi dei comandi dell'editor tramite Get-EditorCommand e $psEditor.GetEditorCommand(), rendendo tali nomi disponibili per annullarne la registrazione.