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When an event bus is configured publish an event each time a new port mapping is updated. Publication is unconditional and occurs prior to calling any callback that is registered. For now, the callback is still fired in a separate goroutine as before -- later, those callbacks should become subscriptions to the published event. For now, the event type is defined as a new type here in the package. We will want to move it to a more central package when there are subscribers. The event wrapper is effectively a subset of the data exported by the internal mapping interface, but on a concrete struct so the bus plumbing can inspect it. Updates #15160 Change-Id: I951f212429ac791223af8d75b6eb39a0d2a0053a Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>