Add support for FreeBSD

[jonakeys]

Description

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

Related Issue

#4685

Motivation and Context

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

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.12%. Comparing base (2aab22a) to head (61b0432).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4686   +/-   ##
=======================================
  Coverage   28.12%   28.12%           
=======================================
  Files         232      232           
  Lines       23097    23097           
=======================================
  Hits         6495     6495           
  Misses      16161    16161           
  Partials      441      441           

Flag	Coverage Δ
unittests	28.12% <ø> (ø)

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[gaius-qi]

@jonakeys Please rebase main.

[mingcheng]

Hi, @jonakeys, thank you for your contribution. I also think you should update and add the GitHub action for the FreeBSD platform tests.

[jonakeys]

Hi, @jonakeys, thank you for your contribution. I also think you should update and add the GitHub action for the FreeBSD platform tests.

That's right. I will look into that, fix/add them to this request.