Add the following metrics to be tracked in FTDC:

network: {
    averageTimeToCompletedTLSHandshakeMicros
    averageTimeToCompletedHelloMicros
    averageTimeToCompletedAuthMicros
} 

We should be able to take advantage of the existing IngressHandshakeMetrics class to record samples, and a small class we provide to a MetricBuilder that will calculate and report the averages.