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

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Provide a general summary of your changes

How Has This Been Tested?

Unit and integration tests.

Types of changes

• [ ] Bug fix :bug: (non-breaking change which fixes an issue)
• [ X] New feature :sparkles: (non-breaking change which adds functionality)
• [ ] Breaking change :boom: (fix or feature that would cause existing functionality to change)

Checklist:

• [ X] My code follows the code style of this project :beers:.
• [ X] My change requires a change to the documentation :bulb: and I have updated the documentation accordingly.
• [ X] I have read the CONTRIBUTING document :busts_in_silhouette:.
• [X ] I have added tests to cover my changes :tada:.
• [ X] All new and existing tests passed :white_check_mark:.