C++ metrics are still calculated for lambdas

[barnabasdomozi]

In the database we still see C++ metrics calculated for lambdas despite --cppmetrics-ignore-lambdas flag is used.

Example snippet:

#include <iostream>
#include <functional>

void foo(std::function<void()> f) {
  f();
}

int main()
{
  foo([&] () { // <---- Type 2 and 4 metric still calculated for this line
    std::cout << "hello world!\n";
  });
}

• Type 2: MCCABE_FUNCTION
• Type 4: BUMPY_ROAD

Goal: add an option to NOT calculate metrics for anonymous classes or compiler generated types.