WIP: fix json encoding#1

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mhoffm-aiven wants to merge 3 commits intomhoffm-fix-python-json-encodingfrom

mhoffm-refactor-python-io-to-fix-json-encoding

Commits on Aug 31, 2021

WIP: refactor data_writer to pass control to the encoder when writing compound objects
mhoffm-aiven
committed

Commits on Sep 6, 2021

WIP: make encoder an abstract class; depend on encoder in DatumWriter; start refactoring deocder and DatumReader
mhoffm-aiven
committed

Commits on Oct 4, 2021

WIP: decouple datumreader from decoder
mhoffm-aiven
committed