Add a compatibility shim for using contrib.funsor with existing models #2997
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This PR makes a few small changes to Pyro's
EnumMessenger,MarkovMessenger,EnumAllocatorandDimAllocatorwhich allow the use of existing Pyro models and primitives withpyro.contrib.funsor(especially @ordabayevy's new inference algorithms likepyro.contrib.funsor.infer.TraceMarkovEnum_ELBO) without requiring the use ofpyroapi.The changes mostly serve to guarantee that the global state in
pyro.contrib.funsor.runtimeis synchronized with Pyro's existing dimension management state, primarilypyro.poutine.runtime._ENUM_ALLOCATORandpyro.poutine.runtime._DIM_ALLOCATOR.