Add support for displaying process usernames on Windows

[mbikovitsky]

Description

This adds the "User" column to the process table on Windows. Usernames are extracted using the sysinfo library.

The main reason for adding this is that it allows filtering of the processes that belong to the current user.

Testing

Tested by visual inspection:

• The name of the user running the application is correctly displayed.
• When running un-elevated, the usernames of other processes are shown as "N/A".
• When running elevated, the usernames for some of the other processes are displayed. This appears to be a limitation of how sysinfo gathers usernames.

Tested on:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Base: 20.72% // Head: 20.73% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (9b82ad6) compared to base (e7b682a).
Patch coverage: 15.38% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1016      +/-   ##
==========================================
+ Coverage   20.72%   20.73%   +0.01%     
==========================================
  Files          75       75              
  Lines       14681    14683       +2     
==========================================
+ Hits         3042     3044       +2     
  Misses      11639    11639              

Impacted Files	Coverage Δ
src/app/data_harvester.rs	0.00% <0.00%> (ø)
src/app/data_harvester/processes.rs	0.00% <ø> (ø)
src/app/query.rs	0.00% <0.00%> (ø)
src/widgets/process_table/proc_widget_column.rs	13.92% <0.00%> (ø)
src/widgets/process_table/proc_widget_data.rs	9.58% <0.00%> (+0.06%)	⬆️
src/widgets/process_table.rs	14.35% <100.00%> (+0.32%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[ClementTsang]

Seems fine to me. Thanks for adding this, I'll merge sometime soon unless I spot something else.

[ClementTsang]

@all-contributors please add @mbikovitsky for code.

[allcontributors]

@ClementTsang

I've put up a pull request to add @mbikovitsky! 🎉