Generate plugin_firmware_index.json with new boards data

[MatteoPologruto]

Generate a new index for new boards named plugin_firmware_index.json, with the boards as the following entry:

  {
    "fqbn": "arduino:renesas_uno:unor4wifi",
    "firmware": [
      {
        "version": "0.1.0",
        "url": "https://downloads.arduino.cc/arduino-fwuploader/firmwares/ESP32-S3/0.1.0/ESP32-S3.bin",
        "checksum": "SHA-256:37c4f003373448504d49d5e3c1754d1d90b9bba3f8f3b529b435d331ca6900b1",
        "size": "3951616",
        "module": "ESP32-S3"
      },
      {
        "version": "0.2.0",
        "url": "https://downloads.arduino.cc/arduino-fwuploader/firmwares/ESP32-S3/0.2.0/ESP32-S3.bin",
        "checksum": "SHA-256:cb535826ba96d4f51bdac33d252c24bd9c692a7bef56710ec0431979cef09fc3",
        "size": "3951616",
        "module": "ESP32-S3"
      }
    ],
    "uploader_plugin": "arduino:uno-r4-wifi-fwuploader@1.0.0",
    "additional_tools": [
      "arduino:espflash@2.0.0",
      "arduino:bossac@1.9.1-arduino5"
    ],
    "module": "ESP32-S3",
    "name": "Arduino Uno R4 WiFi"
  }

The old module_firmware_index.json can still be generated using the --no-new flag when launching the script.

[umbynos]

I replaced the "placeholder firmware" with:

• 0.1.0 elegantly slapped together with this script
• 0.2.0 as is provided in the release section

I also uploaded them to S3.

[umbynos]

Actually with @cmaglie we decided it was best to have two separate json files. The old module_firmware_index.json and a new plugin_firmware_index.json file: containing only the new plugin supported boards. This way we can avoid showing unsupported board in case of arduino-fwuploader firmware list with an old version of the fw uploader. The generator.py and the CI should consider this.