Fix Maybereshuffle

[xliee]

This pull request includes changes to the expand method in the sdks/python/apache_beam/transforms/core.py file to simplify the code and remove an unnecessary inner class. The most important changes include the removal of the MaybeReshuffle inner class and the restructuring of the expand method.

Code simplification and restructuring:

• sdks/python/apache_beam/transforms/core.py: Removed the MaybeReshuffle inner class and restructured the expand method to directly use pcol with Reshuffle if necessary.
• sdks/python/apache_beam/transforms/core.py: Adjusted the return statement in the expand method to simplify the pipeline construction.

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