Support type hint annotations on @ptransform_fn functions
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bug
core
P3
python
types
- Dominant language
- Java
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Description
As a followup to https://issues.apache.org/jira/browse/BEAM-10258, we would like to support PTransforms generated by the @ptransform_fn decorator.
These functions are essentially an expand() method.
Imported from Jira [BEAM-11147](https://issues.apache.org/jira/browse/BEAM-11147). Original Jira may contain additional context.
Reported by: udim.
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