other: make gpu memory collection configurable

[ClementTsang]

Description

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

Follow-up to #794, this makes GPU memory collection toggleable.

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, 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: 18.73% // Head: 18.82% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (a75fe45) compared to base (bd35bbd).
Patch coverage: 28.84% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #835      +/-   ##
==========================================
+ Coverage   18.73%   18.82%   +0.08%     
==========================================
  Files          71       71              
  Lines       13493    13500       +7     
==========================================
+ Hits         2528     2541      +13     
+ Misses      10965    10959       -6     

Impacted Files	Coverage Δ
src/app.rs	0.00% <ø> (ø)
src/app/data_harvester.rs	0.00% <0.00%> (ø)
src/app/data_harvester/memory/general/heim.rs	0.00% <0.00%> (ø)
src/app/layout_manager.rs	62.50% <ø> (ø)
src/canvas/widgets/mem_basic.rs	0.00% <0.00%> (ø)
src/options.rs	42.23% <0.00%> (+0.84%)	⬆️
src/clap.rs	100.00% <100.00%> (+0.30%)	⬆️

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