Add additional metrics regarding log dispatching and committal #316
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Background and rationale: CSL-5488
This PR adds three metrics:
consul.raft.leader.dispatchNumLogs(gauge) - This metric measures the number of logs committed to disk in a batch.consul.raft.commitNumLogs(gauge) - This metric measures the count of logs processed for application to the FSM in a single batch.consul.raft.fsm.enqueue(timer) - This metric measures the amount of time to enqueue a batch of logs for the FSM to apply.