ci: setup cppcheck for codeclimate

[faustbrian]

Summary

C++ isn't supported out of the box but requires a plugin to be configured. See https://docs.codeclimate.com/docs/cppcheck and https://github.com/antiagainst/codeclimate-cppcheck#configuration.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #159 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   91.59%   91.59%           
=======================================
  Files          33       33           
  Lines         857      857           
=======================================
  Hits          785      785           
  Misses         72       72

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