Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2706
- Update partition count changes in Kafka dynamically during runtime
- Checkstyle fixes
- PartitionHandler changes
- Improved handling of expression with 'payload' in the logic
- Removed getter/setter for PartitionHandler and use ReflectionUtils within Test
- Renamed property to 'dynamicPartitionUpdatesEnabled' and improved documentation (also one line per sentence)
- Improved/renamed test to use embeddedkafka and really test update behaviour
- Javadoc
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