net/webrtc/whep: add WHEP client signaller
Rewrite the whepsrc
element with WHEP Client as a signaller
on top of webrtcsrc
webrtcsrc: Add capability to initiate offer and handle answer.
Add the handler for session-request signal from the signaller to initiate an offer
In the session-description signal handler, if the sdp is an answer type handle the answer from the remote peer and create the src pad using the media caps of sendonly type media
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Rebase to main once !1339 (merged) is merged
Edited by Taruntej Kanakamalla