[Feature] Expose __version__ in the pypaimon_rust Python module #1205

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Motivation

Most Python packages expose their version as a module attribute, and PyO3 extensions usually do the same. Examples: pyarrow.__version__, datafusion.__version__, polars.__version__, pydantic_core.__version__, orjson.__version__, lance.__version__. Users and downstream libraries expect pypaimon_rust.__version__ to work too, for bug reports, logging, and feature checks.

Solution

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Anything else?

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Willingness to contribute

• I'm willing to submit a PR!