Take advantage of MediaCodecVideoEncoder class to hint on hardware support for video codecs

[atsakiridis]

Would be nice to:

1. Be able to tell from logs which codecs a device supports in hardware. That way we can better help customers/community
2. If user uses a codec that is not HW supported, while there's hardware support from their device for alternative codec, hint them that they should switch
3. We could automatically switch to take advantage of best HW supported codec

For more info check PeerConnectionClient.java and also MediaCodecVideoEncoder.isVp8HwSupported()/isVp9HwSupported()/isH264HwSupported()