Giorgi / DuckDB.NET / 37757240634

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Check the column and get its writer in one inlined step

CheckColumnAccess was a real call for every appended value, because its
body held the interpolated error message, and the array access after it
had its own bounds check. GetCurrentWriter does one unsigned check and
returns the writer; the throw is in a separate method so it can be
inlined. Appending numeric values is about 5% to 9% faster.

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

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