rtpbasepay2: Consider RTP header extension size in max payload size
The following discussion from !1424 (merged) should be addressed:
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@slomo started a discussion: This is something that would be worth fixing, and I think we can fix this in the new base classes. But as the old ones have exactly the same bug, and API changes are not a problem here, I'd leave this for the future. It doesn't block this MR.