* HBASE-24205 - Create metric to know the number of reads that happens from memstore (branch-2) * Add the optimization as in master and fix whitestyle and checkstyle * Fix compilation error that accidently crept in Authored-by: Ramkrishna <ramkrishna@apache.org> Signed-off by:Anoop Sam John<anoopsamjohn@gmail.com> Signed-off by:Viraj Jasani<virajjasani@apache.org>