MINOR: quic: Implement ->pacing_delay_ns cc callback for cubic

This callback returns the pacing delay in nanoseconds between packet (or bursts)
to be sent. This is what is computed by quic_pacing_ns_pkt().

Author: haproxyFred

src/quic_cc_cubic.c

@@ -1,6 +1,7 @@
 #include <haproxy/global-t.h>
 #include <haproxy/quic_cc.h>
 #include <haproxy/quic_cc_hystart.h>
+#include <haproxy/quic_pacing.h>
 #include <haproxy/quic_trace.h>
 #include <haproxy/ticks.h>
 #include <haproxy/trace.h>
@@ -680,12 +681,18 @@ static void quic_cc_cubic_state_cli(struct buffer *buf, const struct quic_cc_pat
 	              (long long)(path->cwnd - c->last_w_max));
 }
 
+unsigned long long quic_cc_cubic_pacing_delay_ns(const struct quic_cc *cc)
+{
+	return quic_pacing_ns_pkt(&cc->qc->qcc->tx.pacer);
+}
+
 struct quic_cc_algo quic_cc_algo_cubic = {
 	.type        = QUIC_CC_ALGO_TP_CUBIC,
 	.init        = quic_cc_cubic_init,
 	.event       = quic_cc_cubic_event,
 	.slow_start  = quic_cc_cubic_slow_start,
 	.hystart_start_round = quic_cc_cubic_hystart_start_round,
+	.pacing_delay_ns = quic_cc_cubic_pacing_delay_ns,
 	.state_trace = quic_cc_cubic_state_trace,
 	.state_cli   = quic_cc_cubic_state_cli,
 };