I wonder if this could be made easier to customize / pluggable. For Lyft, we 
want to override the factory provider for the default environment for Python. 
It would be nice if we can just drop an annotated class into the classpath, 
similar to what we now do for native transforms. This can be outside of this 
PR, but it would be good to support: 
https://issues.apache.org/jira/browse/BEAM-4819 @mxm 

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