Giorgi / DuckDB.NET / 37243237375

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Test the mapped appender with every supported property type

The mapped appender tests used only int, string, float, DateTime and
byte[] properties, so most branches of PropertyMapping.AppendToRow never
ran. A new test maps bool, sbyte, short, long, byte, ushort, uint, ulong,
double, decimal, DateTimeOffset, TimeSpan, Guid, BigInteger, DateOnly and
TimeOnly, plus a nullable int and a null string, and reads the values
back.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CzLKjBGAwccxYB6ny5bpmY

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