[PDO] Bound-check column index in getColumnMeta() - #23654
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getColumnMeta() indexed stmt->columns[colno] as soon as the driver get_column_meta hook reported success, without verifying that columns had been described or that colno was below column_count, so a driver returning unconditional success made an unexecuted statement segfault and an oversized index read out of bounds. Reject both cases with ValueError like the fetch paths do. Sibling audit: all other stmt->columns[] sites are inside describe_columns() loops or bound-checked paths.
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PDOStatement::getColumnMeta() indexed columns as soon as the driver hook succeeded, without checking that columns had been described or that the index was in range, so a driver that reports success unconditionally (pdo_odbc) segfaulted on an unexecuted statement. Both cases now raise ValueError, matching the fetch paths. Drivers that report failure themselves still return false.