Adds order_by statement for Delete and Update builders in SQLite

[belchior]

The clauses limit and offset are behind a flag at SQLite, more info.

Basic API

#[cfg(feature = "sqlite")]
{
  use sql_query_builder as sql;
  
  let delete = sql::Delete::new()
    .order_by("created_at asc");
    
  let expected = "ORDER BY created_at asc";
  assert_eq!(expected, delete.as_string());
}

References

• https://sqlite.org/lang_update.html
• https://sqlite.org/lang_delete.html