aqm-eval-suite: upgrade CMake

This merge request addresses #2 that replaces the existing Waf‐based build configuration of the AQM Evaluation Suite with a CMake‐based build system. In addition, it updates deprecated code in the example simulations and accompanying Python scripts, applies automatic formatting and linting, and adds comments where necessary so that the new GitLab CI pipelines pass without errors.

After approval, I will squash the MR into clean commits using the ns-3 commit style and merged on top of MR !2.