Add networkbench webserver benchmark

[dpdani]

This PR adds a benchmark aimed at simulating a realistic webserver workload. The README gives a high-level overview of what's going on inside.

The benchmark has been executed with the Dockerfile which builds CinderX with Meta Python 3.12, enabling LTO+PGO+BOLT and using the benchmark itself as profile information for them. Additionally, the cinderx binary is bundled into the python binary. The Dockerfile sits at the root of the repo because I had to make some changes to setup.py to make PGO run networkbench to get profile information, but this may be reworked if the change lands into CinderX otherwise. (Building this Docker image takes a significant amount of time.)

This is how I've run the benchmark so far:

docker build . --tag cinderx_networkbench && docker run cinderx_networkbench

I have not tried to mesh this benchmark together with the existing cinderx/benchmarks/runner.py, since the build process might make it quite distinct, though I'd appreciate feedback on this.

Moreover, I'd like to get feedback on the benchmark overall, is this useful for developing cinderx further?

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[Yhg1s]

Because it was my suggestion in one of our meetings, let me just point out that training the binary on the benchmark is not the end goal, it was to establish the upper bound of the benefit of PGO.

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