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Read and write negative intervals

DuckDB's interval micros is signed (duckdb_interval.micros is int64_t) and days can be negative, but
DuckDBInterval converted both as unsigned: reading any negative interval as a TimeSpan threw
ArgumentOutOfRangeException ("INTERVAL '-90 minutes'", even "-2 days"), a negative month was silently
dropped instead of refused, and binding or appending a negative TimeSpan threw OverflowException.

Micros stays a ulong for compatibility and is read and written as its two's complement. A non-zero
month count, either sign, is refused, and the range check is done in Int128.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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