[Feature] Allow more than one firmware for each chip, with menu

esp-web-tools has been great at allowing users to easily flash the Open Source Espruino JS interpreter onto a device: https://www.espruino.com/Espressif+Flash

It's working great - the only problem is that multiple different devices can contain the same chip. For instance we have one generic firmware for the ESP32 dev boards, but then if a user has the ESP32 CYD (cheap yellow display) they would want a firmware that instantiates the display out the box.

You can't detect what the device is, but I'd love to be able to do:

```
"builds": [
{
"chipFamily": "ESP32",
"description": "Generic ESP32 Devboard",
"parts": [ ... ]
},
{
"chipFamily": "ESP32",
"description": "ESP32 Cheap Yellow Display (CYD)",
"parts": [ ... ]
},
{
"chipFamily": "ESP32-C3",
...
```

and have esp-web-tools pop up a menu asking the user which firmware they'd like to install if more than one matched the chip...