feature: basic sortable disk

[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:

Adds basic sorting + shortcuts for disk.

Issue

If applicable, what issue does this address?

Closes: #567

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, 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-commenter]

Codecov Report

Base: 18.67% // Head: 18.55% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (b63cd2b) compared to base (4d9f509).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #870      +/-   ##
==========================================
- Coverage   18.67%   18.55%   -0.13%     
==========================================
  Files          74       74              
  Lines       13604    13696      +92     
==========================================
  Hits         2541     2541              
- Misses      11063    11155      +92     

Impacted Files	Coverage Δ
src/app.rs	0.00% <0.00%> (ø)
src/app/widgets/cpu_graph.rs	0.00% <0.00%> (ø)
src/app/widgets/disk_table.rs	0.00% <0.00%> (ø)
src/bin/main.rs	39.17% <0.00%> (-0.62%)	⬇️
src/lib.rs	6.37% <0.00%> (-0.04%)	⬇️

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