* INT-4389: Default to SimpleSeqSizeReleaseStrategy
JIRA: https://jira.spring.io/browse/INT-4389
An `AbstractCorrelatingMessageHandler` fallback to the
`SimpleSequenceSizeReleaseStrategy` when `releaseStrategy` isn't
provided.
* Make `ReleaseStrategyFactoryBean` to fallback to the
`SimpleSequenceSizeReleaseStrategy` for consistency.
* * Fix `ResequencerParser` to fallback to the null `releaseStrategy`.
This way a subsequent `releasePartialSequences` will set a
`SequenceSizeReleaseStrategy` as a default one
* * Fix `BarrierMessageHandler` to populate a default `CorrelationStrategy`
* * More polishing to `BarrierMessageHandler`
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