Enhance file system abstraction with timestamps, Unix modes, and performance improvements

[devlead]

This issue outlines comprehensive enhancements needed for the Cake file system abstraction layer to improve functionality, performance, and test coverage.

Key Areas for Implementation

1. File System Interface Enhancements

• Add comprehensive timestamp support across IFile/IDirectory interfaces
• Implement LastWriteTimeUtc, CreationTimeUtc, LastAccessTimeUtc properties
• Add UnixFileMode property for cross-platform file permissions
• Implement Set* methods for timestamp and Unix file mode manipulation
• Add SetCreationTime, SetCreationTimeUtc, SetLastAccessTime, SetLastAccessTimeUtc, SetLastWriteTime, SetLastWriteTimeUtc methods
• Add SetUnixFileMode method with proper OS platform attributes

2. Performance Improvements

• Replace GetFiles/GetDirectories with EnumerateFiles/EnumerateDirectories in Directory.cs
• Refactor FakeDirectory to use yield return for lazy evaluation
• Implement performance optimizations for large directory operations

3. Test Infrastructure

• Create dedicated Cake.Testing.Tests project
• Add comprehensive unit test coverage for FakeFile and FakeDirectory operations
• Implement snapshot testing with Verify library
• Add cross-platform test coverage (Windows, Linux, OSX, FreeBSD)
• Integrate Microsoft.Extensions.TimeProvider.Testing for reliable time handling

4. Test Coverage Gaps

• Add tests for Create(), Move(), Delete() operations
• Add tests for GetDirectories() and GetFiles() with various filters and search scopes
• Add tests for timestamp and Unix file mode operations
• Add tests for error scenarios and edge cases

5. Cross-Platform Support

• Ensure Unix file mode support works correctly across platforms
• Add proper OS platform attributes for Windows-specific limitations
• Test file system operations on different operating systems

Expected Benefits

• Performance: Lazy evaluation and enumeration-based operations for better memory usage
• Functionality: Complete timestamp and Unix file mode support
• Reliability: Comprehensive test coverage with snapshot testing
• Maintainability: Dedicated test project with clear separation of concerns

[github-actions]

🎉 This issue has been resolved in version v6.0.0 🎉

The release is available on:

• GitHub Release
• .NET Tool

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