macbre / sql-metadata / 28478216839

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Align Parser return-type hints with actual UniqueList returns (#632)

Properties like `columns`, `tables`, `with_names`, `subqueries_names`,
and `columns_aliases_names` were annotated as `list[str]` but actually
returned `UniqueList`, which silently deduplicates on append. The
mismatch surprised callers who wrote tests against `list` semantics and
got dedup behavior at runtime.

Updates the annotations (and matching extractor signatures in
`TableExtractor.extract`, `NestedResolver.extract_cte_names`,
`NestedResolver.extract_subqueries`) to declare `UniqueList`, so the
public contract reflects what the code has always done.

Resolves #291.

Co-authored-by: Claude <noreply@anthropic.com>

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