JIRA: https://jira.spring.io/browse/INT-3551 * Rename `MetadataKeyStrategy` -> `MetadataEntryStrategy` * Add `valueStrategy` to the `MetadataStoreSelector` * Add `value-strategy` and `value-expression` to the `<idempotent-receiver>` INT-3551: Add `@IR` support on service methods Rework `MetadataKeyStrategy` just to the `MessageProcessor` Fix Docs Minor Doc Polishing.