perf(rust/sedona-functions): implement ST_Boundary with geo-traits - #1256
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Moves ST_Boundary from sedona-geos into the native sedona-functions set and replaces its GEOS round-trip with direct geo-traits traversal and incremental WKB output. Preserves GeometryCollection aggregation, dimensionality, empty outputs, and the mod-2 boundary node rule for MultiLineStrings. Moves the Criterion coverage into the native benchmark suite. Verified with all 564 sedona-functions tests, all 271 remaining sedona-geos tests, and clippy with warnings denied.
Closes #303