Add TTL support for CSC

[wp973]

Feature Request

The default local cache implementation of CSC does not include the TTL. This may cause the following problems:

• The data in the local cache is inconsistent with the data in Redis(when invalidation messages cannot be received normally (e.g., the connection is broken)).

Some suggestions:

• Add support for TTL in the default cache implementation.
• Provide adapter examples for using third-party cache libraries(e.g, caffeine).

[ggivo]

The idea of CSC is a bit different.
In the case of client-side caching, the protocol propagates invalidation signals and triggers cache evictions.

If more customizations are required, there are a number of libraries that support a rich set of caching options like caffeine, guava... I think we should not add additional complexity to Jedis itself by implementing/maintaining additional generic cache features.

Still we are missing a good documentation how to use external cache implementation

[ggivo]

By missing a good documentation I mean for example document/provide an example of how to create an adapter of the Cache interface that can be used with Jedis using an arbitrary third-party library.