Track row stats per CF at compaction time
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                 Key: CASSANDRA-870
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-870
             Project: Cassandra
          Issue Type: New Feature
          Components: Tools
            Reporter: Jonathan Ellis
            Assignee: Brandon Williams
            Priority: Minor
             Fix For: 0.6


min/max/mean of row size in columns and bytes would be useful to expose via jmx 
(don't worry about nodetool for now)

it is tempting to expose an SSTableMBean but I don't really want to get into 
dynamically un-registering those when they get compacted.  So let's just expose 
each metric as a List<Long> in CFSMBean

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