Provide global database-aggregated latency stats

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      The global latency stats Server Status section currently aggregates all the latency information known to the server.
      We have a need for the same information except aggregated by database.

      For example, today we have:

      db.serverStatus().opLatencies
{
	"reads" : {
		"latency" : NumberLong(9404373),
		"ops" : NumberLong(90552)
	},
	"writes" : {
		"latency" : NumberLong(4846358),
		"ops" : NumberLong(22579)
	},
	"commands" : {
		"latency" : NumberLong(8227275),
		"ops" : NumberLong(108682)
	},
	"transactions" : {
		"latency" : NumberLong(0),
		"ops" : NumberLong(0)
	}
}

      I'm hoping to get a response like this, probably using an aggregation stage like $collStats:

      use admin
db.system.aggregate( [ { $globalLatencyStats: { latencyStats: { } } } ] );
{[{    "db" : "firstdb",
	"reads" : {
		"latency" : NumberLong(9404373),
		"ops" : NumberLong(90552)
	},
	"writes" : {
		"latency" : NumberLong(4846358),
		"ops" : NumberLong(22579)
	},
	"commands" : {
		"latency" : NumberLong(8227275),
		"ops" : NumberLong(108682)
	},
	"transactions" : {
		"latency" : NumberLong(0),
		"ops" : NumberLong(0)
	}},
   {    "db" : "seconddb",
	"reads" : {
		"latency" : NumberLong(9404373),
		"ops" : NumberLong(90552)
	},
	"writes" : {
(etc...)

            Assignee:
            [DO NOT USE] Backlog - Query Execution
            Reporter:
            Eric Milkie
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              Created:
              Updated: