Add namespace information to info command

[Furisto]

Version           0.0.1
Kernel-Release    5.11.0-27-generic
Kernel-Version    #29~20.04.1-Ubuntu SMP Wed Aug 11 15:58:17 UTC 2021
Architecture      x86_64
Operating System  Ubuntu 20.04.2 LTS
Cores             4
Total Memory      5881
Cgroup version    v1 and v2
Cgroup mounts
  blkio           /sys/fs/cgroup/blkio
  cpu             /sys/fs/cgroup/cpu,cpuacct
  cpuacct         /sys/fs/cgroup/cpu,cpuacct
  cpuset          /sys/fs/cgroup/cpuset
  devices         /sys/fs/cgroup/devices
  freezer         /sys/fs/cgroup/freezer
  hugetlb         /sys/fs/cgroup/hugetlb
  memory          /sys/fs/cgroup/memory
  net_cls         /sys/fs/cgroup/net_cls,net_prio
  net_prio        /sys/fs/cgroup/net_cls,net_prio
  perf_event      /sys/fs/cgroup/perf_event
  pids            /sys/fs/cgroup/pids
  unified         /sys/fs/cgroup/unified
Namespaces        enabled
  mount           enabled
  uts             enabled
  ipc             enabled
  user            enabled
  pid             enabled
  network         enabled

[Furisto]

Only tested on Ubuntu for now. If you run a different distribution I encourage you to try it out and give me feedback.