Add support for user-defined text information frames (TXXX/TXX)

[chicio]

Description

Implements support for ID3 user-defined text information frames following the TXXX (v2.3/v2.4) and TXX (v2.2) specifications. This feature allows storing custom text fields with description + content pairs.

• Add ID3FrameUserDefinedTextInformation class with description and content properties
• Update FrameType and FrameName enums with userDefinedTextInformation support
• Implement parsing operation with proper UTF-16 BOM and null terminator handling
• Add frame creation logic supporting all ID3 versions and encodings
• Update all tag builders (v2, v3, v4) with userDefinedTextInformation methods
• Add comprehensive unit tests for parsing and creation operations
• Add integration tests in ID3TagEditorWriteReadAcceptanceTest

Fixes #49

🤖 Generated with Claude Code

Provide a general summary of your changes

How Has This Been Tested?

Unit and integration tests.

Types of changes

• Bug fix 🐛 (non-breaking change which fixes an issue)
• [ X] New feature ✨ (non-breaking change which adds functionality)
• Breaking change 💥 (fix or feature that would cause existing functionality to change)

Checklist:

• [ X] My code follows the code style of this project 🍻.
• [ X] My change requires a change to the documentation 💡 and I have updated the documentation accordingly.
• [ X] I have read the CONTRIBUTING document 👥.
• [X ] I have added tests to cover my changes 🎉.
• [ X] All new and existing tests passed ✅.