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Use duckdb_appender_error_data for appender error handling

Switch the appender from duckdb_appender_error (plain string) to
duckdb_appender_error_data, which exposes both the message and the
DuckDB error type. Route all appender error sites through the existing
DuckDBErrorData.ThrowOnError extension (message prefix now optional),
so appender exceptions carry ErrorType, consistent with the Arrow paths.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LWKN1SKSTFDyeqSrA4dfYT

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