Python typehints: support PEP 484 type hints from MapTuple and FlatMapTuple callables
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core
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python
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Description
cc: [~robertwb]
Related: https://issues.apache.org/jira/browse/BEAM-8588
In order to correctly infer the wrapper's input type hints, we need to determine how many of the first positional arguments will be part of the tuple.
Imported from Jira [BEAM-8662](https://issues.apache.org/jira/browse/BEAM-8662). Original Jira may contain additional context.
Reported by: udim.
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