[core] Use setDataPacketTS to timestamp data packets. #2489
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Extracted from #2483 to reduce the scope of changes.
A dedicated function is created for setting packet timestamp depending on whether TSBPD is enabled.
Now
CUDT::packLostData(..)
andCUDT::packData(..)
set packet timestamp themselves, instead of setting it in theCUDT::packData(..)
.It is needed for further changes related to AEAD (#2483) to set the data packet timestamp before encryption because the timestamp forms the associated data.