Altered Zend\Db\Sql to allow mysql to inject a limit when only an offset was provided.
Removed int casting in Zend\Db\Sql's MySQL decorator to support large numbers
Added tests to ensure casting was removed
Added large number as string to MySQL specific decorator test
Merge pull request #5940 from ralphschindler/hotfix/5192

Zend\Db\Sql Allow MySQL to use limit when only offset was provided
Merge branch 'feature/5940' into develop

Close #5940
Fixes #5642
Fixes #5643