Provide a better way for chunking a dump of tables with composite primary key in MySQL Shell

Creating a logical dump of large tables may take a long time, thus can lead to performance degradation of application queries running in parallel. Therefore it is very important to create such dumps as fast as possible. Our feature proposal uses all columns in the composite primary key to find a way to dump data in parallel instead of relying on the first integer column like it is currently implemented in MySQL Shell.