Support for removing metrics registered by CaffeineCacheMetrics

Please describe the feature request. Currently we are able to add instrumentations of lets say caffeine cache based on a reference but we can't remove them.

Rationale The rationale behind this is we have a caffiene cache that is configurable from database config and hence we change the reference for the same and they are re-constructed. In this case we remove the reference to old caches and add new ones but we want to re-register the new ones but since one is already registered with the ealier name the new one is not registered and honoured, hence we should have a way to remove the old ones and be able to replace it with the new ones.