Fix corrupted SQL dumps for nullable unsigned BIGINT and VARBINARY cols - #51
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Nullable BIGINT UNSIGNED columns scan into sql.Null[uint64] and VARBINARY
columns scan into raw []byte, neither of which were handled by RowBuffer's
type switch — both fell through to the default '%s' formatting branch,
emitting Go's bad-verb diagnostic string (sequencenumber/version) or a
stray leading '&' before the value (BINARY-literal UUIDs), corrupting the
dump and breaking import.