TwoWire class is not inherited from Stream

Hi, another compatibility problem between original and esp32. Arduino's `TwoWire` class is inherited from `Stream`, but arduino-esp32's `TwoWire` class is not.

Mainly, library that I want uses `readBytes(char *, size_t )`, but this member function is not exist, it is inherited from `Stream` class.

Is this on purpose? Currently I'm test with `TwoWire : public Stream`

Thanks.