[FEATURE] Add support for SonarCloud

[askpt]

Requirements

Integrate SonarCloud with the .NET SDK to enhance code quality, maintainability, and security. This includes:

• Adding SonarCloud analysis to the CI pipeline
• Configuring coverage reports and quality gates for the main branch
• Ensuring C# code is properly analyzed for vulnerabilities, code smells, and test coverage
• Documenting the integration process and any required configuration files
• Updating project documentation with instructions for contributors
• Verifying successful analysis on PRs and main builds
  This improvement will help maintain high standards for the SDK and provide visibility into code health for contributors and maintainers.