Display locale in `config-schema.json`
### Feature Description

Created a form with input field with `format` as `date-time`
```
            "startDateTime": {
              "title": "Start Date",
              "description": "Start date",
              "type": "string",
              "format": "date-time"
            },
```

Selected date from the popup widget:

<img width="718" alt="Screenshot 2024-11-11 at 7 23 35 PM" src="https://github.com/user-attachments/assets/88c27077-cd50-4b3a-975b-3349bd98495e"><p>

The date was correctly saved in the Homebridge UI config:
```
            "startDateTime": "2024-11-11T19:23:00Z",
```

Given that Homebridge has an international following, I would like to be able to display the locale format expected for the date-time (this would be the user's/browser's locale). Something similar to this photoshopped image
![385080536-88c27077-cd50-4b3a-975b-3349bd98495e](https://github.com/user-attachments/assets/3012c6ac-9505-4f04-a271-487ca527292e)

Using the calendar widget, the selected the date-time is displayed in the field in the user's locale.
