support hash_fn for Python ApproximateUniqueCombineFn transform
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python
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- Java
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Description
ApproximateUniqueCombineFn is using default hash function for estimation.
We can pass a hash_fn and overwrite default hash function to support better estimation performance.
Parent issue: BEAM-6693
Imported from Jira [BEAM-7525](https://issues.apache.org/jira/browse/BEAM-7525). Original Jira may contain additional context.
Reported by: hannahjiang.
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