Improve hot hod statistics

Hot hod would provide how much memory the current cache is in use for store data. This statistics will return the number of bytes that cache is consuming.

A similar method that is only accessible by the server is: https://docs.jboss.org/infinispan/9.4/apidocs/org/infinispan/stats/Stats.html#getDataMemoryUsed()

Hot hod could provide this information too