Implement comprehensive testing infrastructure for CleanCode analyzers

[MO2k4]

• Add MO.CleanCode.Tests project with ReSharper Test Framework integration
• Create test base class and structure for analyzer unit testing
• Implement tests for core analyzers:
  • TooManyDependencies: Interface dependency counting and settings
  • ClassTooBig: Method counting with proper exclusions
  • MethodTooLong: Statement and declaration count limits
• Add comprehensive test data with realistic C# code samples
• Enable testDotNet task in Gradle build pipeline
• Update CLAUDE.md with testing documentation and workflow
• Tests now run automatically before building and publishing

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