StreamChannelTransformer<S, T>.fromCodec  constructor 
- Codec<S, T> codec
Creates a StreamChannelTransformer from a codec's encoder and decoder.
All input to the inner channel's sink is encoded using Codec.encoder, and all output from its stream is decoded using Codec.decoder.
Implementation
StreamChannelTransformer.fromCodec(Codec<S, T> codec)
    : this(codec.decoder,
          StreamSinkTransformer.fromStreamTransformer(codec.encoder));