HTTP/2 does not emit :queue Telemetry event

[sneako]

Would this event start before the :gen_statem.call/2 and end when we get a response (or error/exception)?

Also, this raises the question of whether we should add support for the :pool_timeout option, which would then be passed to :gen_statem.call/3. We would probably want to use a :dirty timeout to avoid copying and sending the request via a spawned proxy process.