Show information of iterators in the respective files under
/proc/<pid>/fdinfo/.

For example, for a task file iterator with 1723 as the value of tid
parameter, its fdinfo would look like the following lines.

    pos:    0
    flags:  02000000
    mnt_id: 14
    ino:    38
    link_type:      iter
    link_id:        51
    prog_tag:       a590ac96db22b825
    prog_id:        299
    target_name:    task_file
    task_type:      TID
    tid: 1723

This patch add the last three fields.  task_type is the type of the
task parameter.  TID means the iterator visit only the thread
specified by tid.  The value of tid in the above example is 1723.  For
the case of PID task_type, it means the iterator visits only threads
of a process and will show the pid value of the process instead of a
tid.

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/bpf/20220926184957.208194-4-kuifeng@fb.com