re-enable zfs feature

[jamartin9]

Description

Re-enable the zfs feature flag by default for deployment.
Show zfs arc stats when available on linux/freebsd.
The code and comments come from the removed heim memory backend.

(PR's for macos/windows zfs support are being reviewed upstream?)

Testing

Compiled on linux/freebsd.
Ran with basic and graph on linux/freebsd.
Ran with and without zfs enabled on linux/freebsd.

• Windows
• macOS
• Linux
• FreeBSD

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)

[ClementTsang]

Oops, thanks for catching this.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.32 ⚠️

Comparison is base (994c11e) 26.54% compared to head (1e9f9f9) 26.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1044      +/-   ##
==========================================
- Coverage   26.54%   26.22%   -0.32%     
==========================================
  Files          80       80              
  Lines       14574    14748     +174     
==========================================
  Hits         3868     3868              
- Misses      10706    10880     +174     

Flag	Coverage Δ
macos-12	26.98% <0.00%> (-0.34%)	⬇️
ubuntu-latest	26.84% <0.00%> (-0.25%)	⬇️
windows-2019	26.69% <0.00%> (-0.34%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/app/data_harvester/memory/sysinfo.rs	0.00% <0.00%> (ø)
src/data_conversion.rs	12.93% <0.00%> (-1.50%)	⬇️
src/app/data_farmer.rs	9.33% <0.00%> (-0.27%)	⬇️
src/canvas.rs	0.00% <0.00%> (ø)
src/app/data_harvester.rs	0.00% <0.00%> (ø)
src/canvas/widgets/mem_basic.rs	0.00% <0.00%> (ø)
src/canvas/widgets/mem_graph.rs	0.00% <0.00%> (ø)
src/bin/main.rs	37.50% <0.00%> (+0.17%)	⬆️

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