Benchmark the HTTP hosts against axum

A C load generator, an axum service with the same document contract (in
memory, fdatasync, and crash-safe replacement), and a runner that pins the
servers and the load to separate CPUs. On the Pi 5, Pure uses about 40%
less memory, wins with a new connection per request and with eight durable
writers (3.2x the crash-safe axum), but loses 5x on keep-alive reads and
1.5x on 64 durable writers: no persistent connections, one thread, eight
connection slots and two fsyncs per commit. Note 075 records the numbers
and the targets.

1 files changed, 518 insertions, 0 deletions

diff --git a/benchmarks/http/axum-baseline/Cargo.lock b/benchmarks/http/axum-baseline/Cargo.lock
new file mode 100644
index 0000000..a3a7869
--- /dev/null
+++ b/benchmarks/http/axum-baseline/Cargo.lock
@@ -0,0 +1,518 @@
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