tcp: Fix handling of retransmission for reassembly

When reassemble_ooo is set, we can do a better job determining
if a segment is retransmitted or not from the reassembler perspective,
which is different than what TCP sequence analysis determines, which
is retransmission from the sender's perspective.

This also allows us to have a good way of dealing with retransmission
but with additional data.

This only works when reassembling out of order is set. Without it,
we fall back to the old method of detecting retransmissions, which
has a harder time with the edge cases.

Fix #17406, fix #15993, fix #13388, fix #13523.

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