DPDK kernel-bypass transport for the trading engine.
Bypasses the Linux kernel network stack entirely by talking directly to the NIC via DPDK's userspace Poll Mode Driver (PMD). TCP/IP processing is handled by smoltcp, a userspace TCP/IP stack.
Feature flag
Requires the dpdk-sys feature and libdpdk installed. Without the
feature this crate is an empty shell, letting it live in the workspace
without requiring system dependencies.