Consider refactoring io.netty.handler.codec to separate ‘jar’ artifacts.

[ghost]

Currently, io.netty.handler.codec java package includes different types of codecs for different purposes (e.g compression/optional 3rd-party serialization/shared codec infrastructure/helpers) all bundled within the same ‘jar’ artifact: ‘netty-codec’. Not all netty use-cases require or make use of these. Consider separating these codecs out to individual ‘jars’ by their functional purpose. This will simplify building smaller-sized purpose-dedicated netty distributions that only contain required modules.