[rust][python] PyPI and crates.io artifacts are missing LICENSE and NOTICE #4091

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Description

Follow-up to #3804, which fixed the source tarball only.

The convenience artifacts have the same gap: maturin roots the wheel/sdist at bindings/python and cargo roots the .crate at crates/fluss, so neither inherits the fluss-rust/LICENSE and fluss-rust/NOTICE added there.

• pyfluss wheel: no license files at all, and no License-File in METADATA
• pyfluss sdist: none in 254 files — and it bundles the Flink/Kafka/Paimon-derived sources that fluss-rust/LICENSE attributes

ASF convenience binaries must carry both, and nothing in CI fails when they don't.

Willingness to contribute

• I'm willing to submit a PR!