Version 2.0.0 - Scenario-based benchmark

Docker setup changed: Dockerfiles were replaced with Docker Compose.
Complete CLI redesign: a full overhaul of the CLI interface (rewritten around Cobra, improved UX).
Extension mechanism updated: moved to scenario-based benchmarking.
Benchmarks changed: benchmark assets were removed.
CI/release improvements: GitHub Actions pipeline + release/build automation (incl. cross-platform builds).