Implement Results Class to Replace Message-Based Result Storage

[Copilot]

This PR enhances the application's result handling by implementing a robust Results class that replaces the previous message-based approach for storing comparison results.

Changes Made

Results Class Enhancements

• Made SourceAlias and TargetAlias properties public for better accessibility
• Added structured result parsing in the constructor
• Added utility methods:
  • GetSummary() - Provides a concise overview of comparison results
  • GetUnmatchedFilesReport() - Generates a formatted report of unmatched files
  • GetResultsAsCSV() - Returns the results in CSV format
  • SaveToFile() and SaveToCSV() - Save results directly to files

New ResultItem Class

• Created a class to provide structured access to individual results
• Parses raw strings into strongly-typed properties
• Provides access to DTA settings, comparison counts, and file information
• Makes it easier to work with results programmatically

UI Improvements

• Updated Form1 to use the enhanced Results class
• Added detailed results display with DTA statistics
• Added summary information dialog
• Added unmatched files reporting
• Uses the Results class directly for file saving

Benefits

• More structured approach to handling results
• Better user feedback with detailed statistics
• Results are now stored in a format that's easier to work with programmatically
• Makes the codebase more maintainable and flexible

Fixes #31.

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