CMake Utils v5

[kammce]

• Split package into v4 and v5 versions to maintain backward compatibility while introducing a modern CMake approach
• v5 introduces explicit find_package() integration instead of the v4 toolchain injection style
• Added C++20 module support with new functions like libhal_add_library() that accept MODULES parameter for .cppm files
• Modernized API design with cleaner, more intuitive function names:
  • libhal_project_init() - Required project setup
  • libhal_add_library() - Create library targets with sources/modules
  • libhal_add_tests() - Simplified test setup with TEST_NAMES or TEST_SOURCES
  • libhal_add_executable() / libhal_build_apps() - Demo/app building
  • libhal_install_library() - Library installation with namespace support
• Updated CI/CD pipeline to build both v4 and v5 packages based on version tags
• Comprehensive documentation overhaul with new README for v5 and preserved v4 docs in v4/README.md