feat: Add comprehensive commit analysis functionality for repository insights

[Copilot]

This PR implements a complete commit analysis system that enables detailed analysis of repository development patterns and contributor activity. The functionality addresses the requirement to "Analise os commits criados na biblioteca" (Analyze commits created in the library).

Features Added

Core Analysis Engine

• CommitAnalysisService: Intelligent service that analyzes commit data and generates comprehensive statistics
• GitCommitAnalysisDTOs: Complete data models for representing commit information, statistics, and analysis results
• Pattern Recognition: Automatic categorization of commits using conventional commit patterns and heuristic analysis

Analysis Capabilities

The system provides detailed insights including:

• Commit Type Analysis: Categorizes commits as feat, fix, docs, chore, etc. with percentage breakdowns
• Contributor Statistics: Identifies top contributors with commit counts, date ranges, and code contribution metrics
• Activity Patterns: Monthly activity trends and development velocity analysis
• Code Metrics: Tracks file changes, line additions/deletions, and net growth
• Intelligent Insights: Generates contextual observations about project health and development patterns

User Interface Integration

• Console Application: Added option 10 to the main menu for interactive commit analysis
• Rich Output: Formatted console display with emojis, colors, and structured sections
• JSON Export: Machine-readable output for integration with other tools

Example Analysis Output

📊 ESTATÍSTICAS GERAIS
• Total de commits: 10
• Contribuidores únicos: 3
• Período: 2025-08-06 até 2025-08-18 (11 dias)
• Arquivos alterados: 179
• Linhas adicionadas: +4873
• Linhas removidas: -1371

🏷️ TIPOS DE COMMIT
• feat: 5 commits (50.0%)
• fix: 2 commits (20.0%)
• refactor: 2 commits (20.0%)

💡 INSIGHTS DA ANÁLISE
• 🚀 Projeto em fase de expansão ativa
• 👑 Principal contribuidor: Petrus (60.0% dos commits)
• ⚡ Atividade recente: 8 commits nos últimos 30 dias

Technical Implementation

Compatibility

• Multi-target Framework: Works with both .NET 8.0 and .NET Standard 2.0
• No External Dependencies: Uses only built-in System.Text.Json for serialization
• Thread-safe Operations: Safe for concurrent usage scenarios

Testing

• Comprehensive Test Suite: 15 unit tests covering all functionality scenarios
• Edge Case Handling: Tests for empty data, various commit message formats, and boundary conditions
• 100% Pass Rate: All tests validate expected behavior and error handling

Code Quality

• Clean Architecture: Separation of concerns with dedicated DTOs, services, and examples
• Extensible Design: Easy to add new analysis metrics or output formats
• Documentation: Comprehensive XML documentation for all public APIs

Usage Example

var service = new CommitAnalysisService();
var commits = GetCommitsFromRepository();
var analysis = service.AnalyzeCommits(commits, "my-repo");

// Rich analysis with insights
Console.WriteLine($"Repository has {analysis.Statistics.TotalCommits} commits");
Console.WriteLine($"Top contributor: {analysis.Statistics.TopContributors.First().Author}");

This implementation provides valuable insights for project managers, developers, and maintainers to understand development patterns, contributor activity, and project health metrics.

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