Improve caching support to include synchronization logic, (potentially) using DLock, from ClientCache apps to coordinate across multiple cache client instances [DATAGEODE-269]

**[John Blum](https://jira.spring.io/secure/ViewProfile.jspa?name=jblum)** opened **[DATAGEODE-269](https://jira.spring.io/browse/DATAGEODE-269?redirect=false)** and commented

TODO


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**Reference URL:** https://jira.spring.io/browse/SGF-791
