Add the StreamUtils library

[bblanchon]

Hi!

I published a new library to help Arduino users dealing with streams.
For now, it allows adding a buffer to a stream and adding log to a stream.

Here is the address:
https://github.com/bblanchon/ArduinoStreamUtils

Thank you very much for adding this to the Library Manager

Best regards,
Benoit

[cmaglie]

done

[bblanchon]

Thanks!