refactor: quick variable/struct/file rename

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Some renames and file movement. No functional changes.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• 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

Attention: Patch coverage is 37.83784% with 23 lines in your changes missing coverage. Please review.

Project coverage is 41.89%. Comparing base (ae14685) to head (f6f3f5e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/widgets/process_table.rs	50.00%	10 Missing ⚠️
src/widgets/process_table/proc_widget_column.rs	37.50%	5 Missing ⚠️
src/widgets/process_table/proc_widget_data.rs	0.00%	4 Missing ⚠️
src/widgets/process_table/query.rs	0.00%	3 Missing ⚠️
src/app.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1620   +/-   ##
=======================================
  Coverage   41.89%   41.89%           
=======================================
  Files         114      114           
  Lines       17639    17639           
=======================================
  Hits         7389     7389           
  Misses      10250    10250           

Flag	Coverage Δ
macos-12	37.31% <37.83%> (ø)
ubuntu-latest	43.66% <37.83%> (ø)
windows-2019	37.22% <37.83%> (ø)

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