feat(python): add LanceDataset.slice() method - #8059
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Adds a slice(start, end, columns=None) convenience method, equivalent to take(list(range(start, end))) but implemented as a thin wrapper over scanner(offset=start, limit=end-start), reusing the existing offset/limit scan pushdown instead of materializing an index list. Fixes lance-format#1808
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Adds a slice(start, end, columns=None) convenience method, equivalent to take(list(range(start, end))) but implemented as a thin wrapper over scanner(offset=start, limit=end-start), reusing the existing offset/limit scan pushdown instead of materializing an index list.
Fixes #1808