Danil Chapovalov 5e57b17283 Introduce helpers to RtpSender to propagate RtpPacketToSend.
The helpers intended to replace and deprecate BuildRtpHeader when
RtpSenderAudio/RtpSenderVideo will be updated to pass RtpPacket class
instead of raw buffer for sending.

BUG=webrtc:5261
R=sprang@webrtc.org

Review URL: https://codereview.webrtc.org/2303283002 .

Cr-Commit-Position: refs/heads/master@{#14051}
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