Update analyzers and add Meziantou.Analyzer https://www.nuget.org/packages/Meziantou.Analyzer/

- Updated GitHub Actions workflow to build and test using dirs.proj instead of solution files.
- Introduced Directory.Build.props and Directory.Packages.props for centralized package management and build properties.
- Added global.json to specify SDK version and MSBuild SDKs.
- Removed legacy solution files (.sln) in favor of a more efficient project structure.
- Enhanced documentation to reflect the new project organization and provide instructions for generating solution files if needed.
- Implemented StringComparer.Ordinal in various dictionary initializations for consistency and performance.
- Updated integration tests to align with the new project structure and ensure compatibility across different environments.

…add-Meziantou.Analyzer