Rework the cmake setup to be a complete C++ solution

[schwehr]

Resources:

• https://github.com/cpp-best-practices/cmake_template
• How to Avoid Headaches with Simple CMake - Bret Brown - C++Now 2025
  • https://bemanproject.org/docs/BEMAN_STANDARD
• Post-Modern Cmake - From 3.0 to 4.0 - Vito Gamberini - C++Now 2025
• CMake 4 0: What You Need to Know from Kitware

Goals:

• Be able to make a nice release that include github release, pypi, and debian
• Remove the third_party tree with gtest and gmock
• Get clang-tidy and cppcheck working
• Have better build instructions