[WIP] split out ZincWorkerImpl into a separate subprocess #3995
+193
−288
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Fixes #3982. Doesn't yet implement the subprocess management, but for now just refactors
ZincWorkerImpl#<init>
andZincWorkerApi
to work with simple serializable data types which is a pre-requisite for sending them over a subprocess boundaryNeeds to wait to 0.13.0 due to API breakage