Add utility to check unknown keys in yaml node

[Levi-Armstrong]

No description provided.

[Levi-Armstrong]

@rjoomen I had to revert your change to the clang-format config because it was not compatible on 20.04.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (1239d19) to head (628f916).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1029   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files         280      280           
  Lines       15909    15909           
=======================================
  Hits        14295    14295           
  Misses       1614     1614           

see 2 files with indirect coverage changes