Centralize handling of caches

Debezium already contains multiple places where caches (usually BoundedConcurrentHashMap) are used. Every place hardoceds its parameters and there is no coordination between them.

We should introduce a central component that will

• provide cache instances based on logical names
• allow those caches instances to be configurable via connector properties like cache.field-name-sanitizer.size etc.
• will expose the caches metrics via JMX

It doesn't need to be exposed in general documentation but can be really useful for perf tuning guide.