Restrict table visibility across keyspaces

This ticket is to capture a specific fine grained authorization request, specifically that users should be able to be restricted to only seeing tables in specific keyspaces.

For example, given keyspaces K1 and K2 and users U1 & U2, allow U1 access to K1, but no access to even see table names in K2. Allow U2 access to K2, but no access to see table names in K1.