Add XDP CLI options and initialization code

[Jake-Shadle]

This adds the support for several XDP specific options, and the initialization code to bring up the XDP I/O loop, falling back to io-uring if setup fails for some reason. This PR always falls back to io-uring at the moment, this is just to get the code in so that it can be iterated on in further PRs, as I only tested that we can spinup quilkin proxy using XDP and shut it down cleanly, not the actual I/O which I'm leaving for tomorrow.

Fixed several bugs:

• Fix bug in ephemeral port range parsing
• Remove warning about eBPF logging, the current eBPF program has no log messages, which makes log initialization fail, but we would want to enable it in the future if we did add logging to the program
• pthread_cancel is apparently super not good and was causing a crash at shutdown due to signal shenanigans, so I just replaced it with an atomic bool for now
• We include the eBPF program inlined in the quilkin binary, but it could be aligned however rustc/LLVM decided, and object parsing requires it be aligned correctly, which for 64-bit ELF files is 8 bytes

[quilkin-bot]

Build Succeeded 🥳

Build Id: 4d82992d-2613-4e7d-b615-550bd0d150e8

The following development images have been built, and will exist for the next 30 days:

• us-docker.pkg.dev/quilkin/ci/quilkin:0.10.0-dev-91876b6

To build this version:

git fetch [email protected]:googleforgames/quilkin.git pull/1069/head:pr_1069 && git checkout pr_1069
cargo build