Add Lock-free Queue (backport #253)

[mergify]

Fixes #14

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This is an automatic backport of pull request #253 done by Mergify.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.78%. Comparing base (4c64752) to head (eecedcf).
Report is 2 commits behind head on humble.

Additional details and impacted files

@@            Coverage Diff             @@
##           humble     #269      +/-   ##
==========================================
+ Coverage   73.45%   74.78%   +1.32%     
==========================================
  Files           9       10       +1     
  Lines         550      579      +29     
  Branches      215      220       +5     
==========================================
+ Hits          404      433      +29     
+ Misses         96       89       -7     
- Partials       50       57       +7     

Flag	Coverage Δ
unittests	74.78% <100.00%> (+1.32%)	⬆️

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Files with missing lines	Coverage Δ
include/realtime_tools/lock_free_queue.hpp	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes