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webrtcbin: Add a signal to plug bandwidth estimator elements

Thibault Saunier requested to merge thiblahute/gstreamer:webrtc-bandwidth-estimator into main

We need GStreamer elements to do the bandwidth estimation as this way they can also control the pacing of the transmission flow as specified in the GCC algorithm for example.

Bandwidth estimator element are placed right before the "RTPSession" as an "rtp-aux-sender" element. This way they can use the "Transport-wide Congestion Control" RTCP feedback messages through the "RTPTwcc" custom events that are sent by the rtpsession.

Applications are responsible to react to the bandwidth estimator element and set the encoder target bitrate etc... which means that we can not pass an estimator as an element factory, so a signal as been chosen instead.

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