Add support for FreeBSD

[jonakeys]

Description

Adding support for compiling and running on FreeBSD (in addition to Linux and MacOS).

Related Issue

#1751

Motivation and Context

It solves the problem that compiling on FreeBSD doesn't work.

Screenshots (if appropriate)

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.42%. Comparing base (00f2bf7) to head (6fe64de).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client-config/src/lib.rs	71.42%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1752   +/-   ##
=======================================
  Coverage   46.42%   46.42%           
=======================================
  Files          87       87           
  Lines       24692    24692           
=======================================
  Hits        11463    11463           
  Misses      13229    13229           

Files with missing lines	Coverage Δ
dragonfly-client-storage/src/content.rs	100.00% <ø> (ø)
dragonfly-client-storage/src/lib.rs	5.12% <ø> (ø)
dragonfly-client-config/src/lib.rs	70.12% <71.42%> (ø)

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