`WiFiStorageFile` should implement the `Stream` interface

[bblanchon]

Hi,

Arduino libraries that handle files usually have a File class derived from Stream.

Here are a few examples:

1. SD
2. ESP32 FS
3. ESP8266 FS
4. Arduino Audio Tools
5. RasPi Bridge
6. SdFat

I think WiFiStorageFile should implement the Stream interface too.

Best regards,
Benoit