selftests/bpf: Add XDP load-balancer common definitions

Add the shared header for the XDP load-balancer benchmark.  This
defines the data structures used by both the BPF program and
userspace: flow_key, vip_definition, real_definition, and the
stats/control structures.

Also provides the encapsulation source-address helpers shared
between the BPF datapath (for encap) and userspace (for building
expected output packets used in validation).

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-5-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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