Add `clang-tidy` for linting of C++ code base

[eirikurj]

Description

While most of the C++ code base is quite good, no linting of the C++ code is done.

Solution

This could be further improved by adding clang-tidy to do linting of the codebase.

[A-CGray]

As an example, one thing we can do with clang-tidy is enforce the camelCase naming convention throughout the C++ code

https://clang.llvm.org/extra/clang-tidy/checks/readability/identifier-naming.html