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For STREAM emission, MUX QUIC generates one or several frames and emit them via qc_send_mux(). Lower layer may use them as-is, or split them to lower chunk to fit in a QUIC packet. It is then responsible to notify the MUX to report the amount of data sent. Previously, this was done via a direct call from quic_conn to MUX using qcc_streams_sent_done(). Modify this to have a better isolation accross layers. Define a send callback handled by the qc_stream_desc instance. This allows the MUX to register each QCS instance individually to the renamved qmux_ctrl_send() which replaces qcc_streams_sent_done(). At quic_conn layer, qc_stream_desc_send() can be used now. This is a wrapper to qc_stream_desc layer to invoke the send callback if registered. This mechanism of qc_stream_desc callback should be extended later to implement other notifications accross the QUIC stack.