Giorgi / DuckDB.NET / 22237670288 / 3

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Fix decimal precision and support scale > 28

Replace lossy double-based Math.Pow(10, scale) with
pre-computed decimal and BigInteger lookup tables.

Use direct decimal constructor and mantissa extraction
instead of arithmetic reconstruction, avoiding
intermediate precision loss.

Handle HugeInt decimals with scale > 28 (beyond .NET
decimal's maximum) by truncating excess digits via
BigInteger division.

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