Use a shared Topic UUID to Name cache

[robobario]

Currently we lookup UUID -> Name metadata on every Consumer connection. A bit unkind to the broker when the UUID -> Name mapping should be very stable and the key unique. We should be able to share a single threadsafe cache across all instances of the Filter for a start. If we could support the cache being scoped to the Virtual Cluster or Target Cluster that would be even nicer to keep them separated.