message: Add possibility to clone Row
  Needed to take some vector element without breaking an vector of rows
  (also needed since try_from_row method can't work with refs)
diff: @@ -15,7 +15,7 @@ use types::tuple::Tuple;
  use types::udt::UDT;
  use types::{ByIndex, ByName, CBytes, IntoRustByIndex, IntoRustByName};
  -#[derive(Debug)]
  +#[derive(Clone, Debug)]
  pub struct Row {
  metadata: RowsMetadata,
  row_content: Vec<CBytes>,
  