Fix supports check on FromMessageConverter: make sure the targetType is on the LHS
Fix PojoToStringMessageConverter: handle message payload tuple separately so that the tupleToString converter is set
- This is a temporary location for the `tuple` project and would eventually be moved to something like `spring-data-commons`
- Note: This project currently removes `batch` package from the tuple project in XD
- The corresponding test classes are yet to be moved.