Better checking for new/updated scopes+streams+schemas

[adrdc]

Currently we will list from pravega:
scopes - these are presto schemas
streams for a scope - these are tables within a presto schema
We will look up group info from schema registry for a groupId (scope.stream)

As there are a lot of lists during queries, this information is now cached, currently held for time period T before it will be evicted and we will refresh.

This needs to be improved. Can we determine if any scopes or streams were added to pravega since time T and refresh the delta, etc.