ws: add latency to ident/ready

when using api_latency during the websocket heartbeat jitter, it will
report 0.00. this resolves that by using the READY event by measuring
time from ident send

additionally, remove headers curl slist free since it would also free
the overarching slist, which isnt created by us. we can dirty it but i
would rather free it in the context that created it so its obvious that
its Not A Memory Leak:tm:

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