Remove dependency on `is`

### A screenshot that you have tested with "Try this API".

This dependency is unnecessary and was compromised a couple of days ago. Most of its downloads come from various Google npm packages. The dependency is generally used pretty minimally for things like checking if an object is a Date, which would be better handled with a small util file vs adding the supply chain risk of an added dependency.

### What would you like to see in the library?

_No response_

### Describe alternatives you've considered

_No response_

### Additional context/notes

_No response_

Cerca nei manifest dei pacchetti e nel codice sorgente del repository gli utilizzi della dipendenza `is`, quindi individua i controlli che fornisce. Sostituisci tali utilizzi con una gestione locale al progetto preservando il comportamento e conferma che la dipendenza sia assente dai manifest e dai lockfile.

Scritto dal modello di indicizzazione a partire dal testo della issue.