Harden DuckDB-owned string handling at FFI boundaries#750
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mlafeldt
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Replaces manual or incorrect ownership handling for DuckDB-allocated C strings with
DuckDbString, ensuringduckdb_freeis used consistently and runs on drop.Also adds null checks before wrapping DuckDB string pointers, tightens
DuckDbStringownership/safety docs, and removes unchecked table-function name construction.