Skip medium lookup when relaying RTCP by plugins #3515
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This PR refactors a bit the code the Janus core uses internally to handle RTCP messages plugins may want to send (e.g., REMB, PLI, etc.). Where before we'd perform lookups to address the right medium instance before queueing the message, we now only perform a few activities before queueing, and let the loop take care of the rest on the right medium. This is to address a potential deadlock that was identified in #3510.