Put ngtcp2 beside quinn in M5, as the design planned

ngtcp2 1.25.0 with OpenSSL 3.5's QUIC TLS (its ossl backend), fetched
and built into build/third by ngtcp2/build.sh; drain.c does in C what
the quinn harness does: one connection, one stream, "pure" and then the
messages each after its u32 length, counted by the service, packets in
GSO bursts. Its stream bytes are a function of their offset, so what
ngtcp2 keeps to send again points into a pattern that never changes.
run.py's drain_ngtcp2 measures both sides' CPU as drain_quic does.

Five rounds each, both sides' CPU a message: 61 B Pure 0.280, ngtcp2
0.270, quinn 0.310 us; 1 KiB 2.62, 3.54, 3.94; 16 KiB 40.2, 54.4, 60.2.

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