Combinator encoding

[dfarr]

Implements combinator like encoders for encoding headers and data.

# default encoder
PairEncoder(HeaderEncoder("resonate:format-py", JsonPickleEncoder()), JsonEncoder())

# json only encoder
PairEncoder(NoopEncoder(), JsonEncoder())

# jsonpickle only encoder
PairEncoder(NoopEncoder(), JsonPickleEncoder())

The primitive encoders we provide could be used to implement more complex encoders to fit many use cases. For the time being only the data encoder (the right hand side of the PairEncoder) can be specified when instantiating resonate to keep configration simple.