vmstat: implement --slabs

[Bluemangoo]

remains a sort issue. I have no idea about how GNU implementation sort it by name, especially the priority of -

parts of GNU outputs:

bio-128                     672    672    192     42
bio-192                    1024   1024    256     32
bio-224                      32     32    256     32
bio-256                      50     50    320     25
bio-352                    2058   2184    384     42
biovec-128                   16     16   2048     16
biovec-64                   512    512   1024     32
biovec-max                  416    448   4096      8

dmaengine-unmap-128        3450   4830   1088     30
dmaengine-unmap-256          15     15   2112     15
dma-kmalloc-128               0      0    128     32
dma-kmalloc-16                0      0     16    256
dma-kmalloc-192               0      0    192     42
dma-kmalloc-1k                0      0   1024     32
dma-kmalloc-256               0      0    256     32
dma-kmalloc-2k                0      0   2048     16
dma-kmalloc-32                0      0     32    128
dma-kmalloc-4k                0      0   4096      8
dma-kmalloc-512               0      0    512     32
dma-kmalloc-64                0      0     64     64
dma-kmalloc-8                 0      0      8    512
dma-kmalloc-8k                0      0   8192      4
dma-kmalloc-96                0      0     96     42
dm_uevent                     0      0   2888     11

[Krysztal112233]

➜  procps git:(feature/vmstat-slabs) cargo run -q  vmstat --slabs
vmstat: Permission denied
➜  procps git:(feature/vmstat-slabs) vmstat --slabs
vmstat: Unable to create slabinfo structure: Permission denied

could you please fix the error output?

[Bluemangoo]

fixed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (4108064) to head (8bd9a1f).
Report is 12 commits behind head on main.

Additional details and impacted files

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##   main   #460   +/-   ##
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