@Override
  public AccountStatsStore getAccountStatsStore() throws Exception {
    return accountStatsStore;
  }
Constructor to create a {@link InmemoryAccountStatsStoreFactory}.
@param verifiableProperties
@param clusterMapConfig
@param registry
ambry-mysql/src/main/java/com/github/ambry/accountstats/InmemoryAccountStatsStoreFactory.java