selftests/bpf: Test load and dump metadata with btftool and skel

This is a simple test to check that loading and dumping metadata
in btftool works, whether or not metadata contents are used by the
program.

A C test is also added to make sure the skeleton code can read the
metadata values.

Signed-off-by: YiFei Zhu <[email protected]>
Signed-off-by: Stanislav Fomichev <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Andrii Nakryiko <[email protected]>
Cc: YiFei Zhu <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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