• Adds aTelemetrySink interface totailnet.Conn to support sending network telemetry events regardless of source.
• Adds aTelemetrySink implemention fortailnetApiConnector, to be used by the CLI.
• Adds aTelemetryStore to atailnet.Conn to store and scrub PII from any data used to construct network telemetry events.
• Sends network telemetry events oncoder speedtest,coder ping, when a workspace agent is reachable, and when an ssh connection session ends.
• Adds a way to disable network telemetry from the CLI.
• Telemetry is disabled after attempting to send events to a server that doesn't support receiving them.

A future PR will implement the plumbing necessary to record:

• Connection age
• P2P setup time
• Total connection setup time