pmap: implement --device

[cakebaker]

This PR implements -d/--device and creates output in the following format:

13176:   ../hello_world/target/debug/hello_world
Address           Kbytes Mode  Offset           Device    Mapping
000060ab2984a000      24 r---- 0000000000000000 008:00008 hello_world
000060ab29850000     248 r-x-- 0000000000006000 008:00008 hello_world
...
ffffffffff600000       4 --x-- 0000000000000000 000:00000   [ anon ]
mapped: 3060K    writeable/private: 348K    shared: 0K

[codecov]

Codecov Report

Attention: Patch coverage is 72.82609% with 25 lines in your changes missing coverage. Please review.

Project coverage is 60.76%. Comparing base (0a754bc) to head (cc6d948).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/pmap/src/maps_format_parser.rs	55.55%	11 Missing and 5 partials ⚠️
src/uu/pmap/src/pmap.rs	80.64%	2 Missing and 4 partials ⚠️
tests/by-util/test_pmap.rs	88.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   60.62%   60.76%   +0.13%     
==========================================
  Files          44       44              
  Lines        4500     4577      +77     
  Branches      693      711      +18     
==========================================
+ Hits         2728     2781      +53     
- Misses       1611     1625      +14     
- Partials      161      171      +10     

Flag	Coverage Δ
macos_latest	45.47% <0.00%> (-0.63%)	⬇️
ubuntu_latest	58.62% <72.82%> (+0.22%)	⬆️
windows_latest	0.05% <0.00%> (-0.01%)	⬇️

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[sylvestre]

is it expected that they (the map_err) don't return an error message ?

[cakebaker]

Yes, the original pmap doesn't show an error message if /proc/<PID>/maps can't be read:

$ pmap 1 --device
1:   /sbin/init \vmlinuz-linux
$ echo $?
1

In this example, no memory map is shown because /proc/1/maps is not accessible for a normal user.