Support SIP media configs. #136

Job	Run time
Create release PR	0s
Tag release	-1s
Publish livekit (RTC)	-1s
Publish livekit-protocol	-1s
Publish livekit-api	-1s
Build API docs	-1s
Build RTC docs	-1s
Build Protocol docs	-1s
Build Protocol	-6s
Build RTC wheels (${{ matrix.archs }})	-7s
Build API	-7s
Detect package	-9s
Build RTC sdist	-10s
	-46s

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