INT-3354 Fix Priority Order in RedisPCMS

JIRA: https://jira.spring.io/browse/INT-3354

Wrong sort order; was treating priority 0 as highest.
INT-2595: Add Time-Based `ReleaseStrategy` Option

JIRA: https://jira.spring.io/browse/INT-2595

* Add `group-timeout` and `group-timeout-expression` to the Correlation Endpoint
* Add logic to the `AbstractCorrelatingMessageHandler` to schedule group for `forceComplete`,
when the target `ReleaseStrategy` returns `false`

INT-2595: Polishing according PR comments

INT-2595: Expose `lock-registry` and further docs

INT-2595 Doc and Test Polishing

INT-2595: Fix typos

INT-2595 More Minor Doc Polish
INT-3352 RedisLockRegistry

JIRA: https://jira.spring.io/browse/INT-3352

Provid a global lock registry, initially for the correlating
message handlers.

INT-3252 Polishing

- Use a discrete key for each lock and use Redis EXPIRE
- Use an internal DefaultLockRegistry to improve latency
    when threads are using the same registry instance.

INT-3352 More Polish

- Put localLock.unlock() in a finally block.
- Unlock localLock if acquiring the RedisLock fails.

INT-3352 Polishing - PR Comments

- PR Comments
- Improve equals()

INT-3352 Add Aggregator Integration Test

- move lock registry to the `util` package
- Add an aggregator integration test

INT-3352 Add Distributed Aggregator Test

- Simulates a distributed environment with a shared message
    store and distinct lock registries.

INT-3352 More PR Comments

INT-3352 Add Multiple Registry Tests

- Add tests to verify expected behavior when different registries are used.
- Polish javadocs.
INT-3353 Concurrent RedisMetadataStore

JIRA: https://jira.spring.io/browse/INT-3353

Shared metadata for PersistentAcceptOnceFileListFilters.

INT-3353 Polishing; PR Comments
INT-3358: Make `MutableMessage` package protected

JIRA: https://jira.spring.io/browse/INT-3358
INT-3353 Fix Docbook White Space

JIRA: https://jira.spring.io/browse/INT-3355
INT-3351: Add `@Poller` for Messaging annotations

JIRA: https://jira.spring.io/browse/INT-3351
INT-3351: Polishing according PR comments

* Add `property-placeholder` support for `@Poller`
* Change `ref` to `value`
* Add JavaDoc for `array` workaround
* Add docs
INT-3351: Polishing and fixes