bpftool: Add support for querying cgroup_iter link

Support dumping info of a cgroup_iter link. This includes
showing the cgroup's id and the order for walking the cgroup
hierarchy. Example output is as follows:

> bpftool link show
1: iter  prog 2  target_name bpf_map
2: iter  prog 3  target_name bpf_prog
3: iter  prog 12  target_name cgroup  cgroup_id 72  order self_only

> bpftool -p link show
[{
        "id": 1,
        "type": "iter",
        "prog_id": 2,
        "target_name": "bpf_map"
    },{
        "id": 2,
        "type": "iter",
        "prog_id": 3,
        "target_name": "bpf_prog"
    },{
        "id": 3,
        "type": "iter",
        "prog_id": 12,
        "target_name": "cgroup",
        "cgroup_id": 72,
        "order": "self_only"
    }
]

Signed-off-by: Hao Luo <haoluo@google.com>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220829231828.1016835-1-haoluo@google.com


Signed-off-by: Martin KaFai Lau <martin.lau@linux.dev>