Allow the user to customise the columns displayed in `py list`

Is your feature request related to a problem? Please describe.
I don't find the default display of py list particularly useful. The aliases take up a lot of space and aren't very helpful (they are easily deducible from the rest of the data). Ideally, I'd like to be able to choose more useful information to display in place of that column.

Describe the solution you'd like
The --format option allows you to display a single data item (--format=exe). That's fine, but it would be nice to be able to choose multiple values. Something like --format=tag,exe.

Describe alternatives you've considered
You can get this sort of report by piping --format=json into jq, or into a custom formatter, but that's fairly clumsy.

Additional context
Alternative to #86. The approach here is probably overkill, but I've filed it as an option in case changing the default format is unacceptable.

Inizia individuando la gestione di --format del comando py list e confronta il suo output per un singolo elemento con l’output JSON esistente. Definisci come devono essere analizzati e visualizzati i valori separati da virgole, come tag,exe, quindi verifica che più campi selezionati compaiano nell’ordine richiesto senza modificare il comportamento esistente per un singolo valore.