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In order to allow us to measure the performance effects of client-side netmap caching, both with and without the feature enabled, add logs to record how long it takes after a client restart or profile switch for the node to establish contact with peers. We do this by keeping track of a timestamp when each endpoint is constructed, and logging a record for "new" peer contacts that records how long (in microseconds) it took from the time the peer was recorded as a candidate. The message includes whether the contact was via DERP or direct, and whether a cached netmap was in use at the time. This builds on and extends the counters from #19699, but here we include new contacts whether or not a cached netmap is in use, so that we can establish a baseline for comparison. Updates #12639 Updates tailscale/projects#27 Change-Id: I4f6d050e221f3881848d05a0425c4a5d1a59294c Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>