feat: new cognitve complexity metric add

[veledara]

This pull request adds a new metric, Cognitive Complexity, to the CAM project. The metric computes the total cognitive complexity for all methods in a class by analyzing control flow constructs and binary operations

[veledara]

@yegor256 could you check, please?

[yegor256]

@veledara what's the motivation for this one? We already calculate CoCo, via PMD. Why do we need to duplicate it?

[veledara]

@veledara what's the motivation for this one? We already calculate CoCo, via PMD. Why do we need to duplicate it?

@yegor256 i suggest that having our own implementation would offer us flexibility and transparency. moreover - no dependency on external tools like pmd, ensuring consistency and adaptability
what do you think?

[yegor256]

@veledara this may be a reasonable objective, but in order to do this we need to write much more tests that you suggest in this ticket. You simply test a very simple Java snippet, while the metric is not that simple. We need dozens of tests, probably referenced by a baseline (PMD).

[veledara]

@veledara this may be a reasonable objective, but in order to do this we need to write much more tests that you suggest in this ticket. You simply test a very simple Java snippet, while the metric is not that simple. We need dozens of tests, probably referenced by a baseline (PMD).

@yegor256 Your point about comprehensive testing is absolutely valid, but i think this implementation provides a basis so that others can connect and gradually add tests. This way we will start using the metric right away, rather than waiting for the ideal. Also, while the community will make improvements in this metric and add tests, we will have a full-fledged version in the form of pmd, so that is not a problem. We can abandon pmd at the moment when we realize that our implementation is completely sufficient.