feat: implement AppenderParams for tuples #647
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Implements AppenderParams for tuples up to arity 12, allowing ergonomic heterogeneous row insertion without lifetime issues. Users can now write: appender.append_rows(data.iter().map(|(id, name)| (id, name))) Previously, using params with owned values in closures caused lifetime errors because the macro created references that outlived the closure scope. Fixes duckdb#449
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This PR addresses the need for a more ergonomic way to pass heterogeneous sets of parameters (different data types) to the Appender::append_rows method, as detailed in issue #449.
By implementing AppenderParams for tuples, it resolves common lifetime issues when passing data from iterators.