Add clang-tidy checks on CI

[jbcoe]

Add a clang-tidy CI action.

Add a script to create a duplicate-free version of compile_commands.json so that we don't have multiple entries for any source file.

Make .cc source non-PRIVATE in CMake libraries so that it gets mentioned in compile_commands.json (There may be a nicer fix for this).

Fixes #550

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.60%. Comparing base (840a406) to head (80592de).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #555   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files          11       11           
  Lines         750      750           
  Branches       76       76           
=======================================
  Hits          747      747           
  Misses          3        3           

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[Twon]

Looks good, thanks for applying the suggested changes.

[jbcoe]

Thanks for helping me sort the CMake issues