Implement support for FreeBSD

[wezm]

Description

Adds support for running bottom on FreeBSD.

wmoore@freebsd13:~ $ freebsd-version; uname -a
13.1-RELEASE
FreeBSD freebsd13 13.1-RELEASE FreeBSD 13.1-RELEASE releng/13.1-n250148-fc952ac2212 GENERIC amd64

Notes

• The implementation was achieved though a mix of using sysinfo and some FreeBSD specific code.
• I/O read/write stats are not implemented as I don't believe sysinfo makes this information available at this time.
• The commit history is pretty messy but it shows the process I went though. I would recommend squash merging it, or if preferred I can squash all the commits myself.
• A new dependency on serde_json is added for FreeBSD targets as this code makes use of the ability for some commands in the FreeBSD base system to emit machine readable output in JSON via the libxo library.

Issue

Closes: #480

Testing

I ran this branch of the code on FreeBSD (amd64) and Linux (x86_64). I Checked that it compiles for x86_64 macOS (cargo check --target x86_64-apple-darwin). I have not tested Windows as I do not use it.

• 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, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts

[codecov-commenter]

Codecov Report

Merging #766 (9f2f8fd) into master (e33603d) will decrease coverage by 0.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #766      +/-   ##
==========================================
- Coverage   24.26%   24.12%   -0.15%     
==========================================
  Files          57       60       +3     
  Lines       12907    12982      +75     
==========================================
  Hits         3132     3132              
- Misses       9775     9850      +75     

Impacted Files	Coverage Δ
src/app.rs	0.04% <ø> (ø)
src/app/data_harvester.rs	0.00% <0.00%> (ø)
src/app/data_harvester/cpu.rs	0.00% <0.00%> (ø)
src/app/data_harvester/cpu/heim.rs	0.00% <ø> (ø)
src/app/data_harvester/disks.rs	0.00% <0.00%> (ø)
src/app/data_harvester/disks/heim.rs	0.00% <ø> (ø)
src/app/data_harvester/memory/general.rs	100.00% <ø> (+99.12%)	⬆️
src/app/data_harvester/memory/general/heim.rs	0.00% <0.00%> (ø)
src/app/data_harvester/network.rs	20.00% <ø> (ø)
src/app/data_harvester/processes.rs	0.00% <ø> (ø)
... and 4 more

---

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[ClementTsang]

Finally got some time to look at it, looks good to me. I tested compilation/running on Windows and it works fine too.

I'll add CI for testing/building FreeBSD in a separate PR when I have some time.

[ClementTsang]

@all-contributors please add @wezm for code

[allcontributors]

@ClementTsang

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