Haskell LibP2P - MultiStream implementation

WIP

todo:

• start using quick check to implement tests for handling of multistream muxer.
• need to guarantee multistream protocols start with a '/' and have the correct format (similar to multiaddr)
• need to implement handling of behaviour for parser exceptions inline with go-multistream
• need to include a transport shim for haskell multistream based on go-multistream-muxer
• A lot of the functions over MultistreamMessage are not total functions. Not sure how to deal with this at the moment, other than using a phantom type that splits either Multistream or MultistreamMessage by header or body?

notes:

• When running multistream in ghci using stack, use stack ghci --ghci-options -XOverloadedStrings to pull in the language extension

test suite:

• run stack test