refactor: centralize dataset version policies - #8027
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Part 10/12 of #7877. Depends on #8026.
This is an independently reviewable step toward the final layout demonstrated in #7979.
This PR completes the dataset-level policy boundary. Reads, scans, take, schema evolution, statistics, binary copy, fragment rewriting, conflict resolution, and operation commits delegate through exact V1/V2.0/V2.1/V2.2/V2.3 policies instead of checking file versions throughout dataset and table code.
Shared execution remains shared where behavior is identical; only behavior that actually differs is isolated behind the version modules. A small exact-to-selector bridge remains temporarily at the index boundary so this PR is independently compilable. Part 11 removes that bridge and makes index consumers exact end to end.
Validation:
cargo clippy --all --tests --benches -- -D warnings