Add workflow to compile with clang++ 7 and g++ 8

[rmisev]

• Remove unnecessary cmake options from Ubuntu and macOS workflows
• Add workflow to compile with clang++ 7 and g++ 8

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.66%. Comparing base (f704bd6) to head (e2f0308).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #114   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          16       16           
  Lines        2671     2671           
  Branches      424      424           
=======================================
  Hits         2662     2662           
  Misses          9        9           

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