This patch adds OSS-Fuzz integration for the RTPProxy project. The
RTPProxy is a companion software used by many of the SIP application
servers (OpenSIPS, Kamailio, Sipppy B2BUA etc) to handle RTP streams. We
have completed integration on our side already, e.g.
https://github.com/sippy/rtpproxy/actions/runs/4226614295/jobs/7340239205.
Maksym Sobolyev