Create a threadsafe cache store for processor

[ph]

As we add more complex processors to beat a lot of them require some sort of caching mechanism to improve performance. Currently, all processors that need cache are implementing their own caching and their refresh mechanism.

Caching values in a processor require you to do a few stuff:

• Clone values
• Clone cache values
• Add locking mechanism to cached Fields.
• Trigger a refresh of the data either on-demand or by a goroutine.

There is no unique way across processors to cache values; this means that if anything of the above is not done correctly, we have the risk to generate a panic concerning concurrency when the events get serialized at the output.

The store should provide a single point of caching and refresh, and should take care of the concurrency.

Of course, it should be flexible enough to be used outside of the processor context.

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