selftests/bpf: Add XDP load-balancer benchmark driver

Wire up the userspace side of the XDP load-balancer benchmark.

24 scenarios cover the full code-path matrix: TCP/UDP, IPv4/IPv6,
cross-AF encap, LRU hit/miss/diverse/cold, consistent-hash bypass,
SYN/RST flag handling, and early exits (unknown VIP, non-IP, ICMP,
fragments, IP options).

Before benchmarking each scenario validates correctness: the output
packet is compared byte-for-byte against a pre-built expected packet
and BPF map counters are checked against the expected values.

Usage:
  sudo ./bench -a -w3 -p1 xdp-lb --scenario tcp-v4-lru-hit
  sudo ./bench xdp-lb --list-scenarios

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-7-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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