Plan to add new properties to OpenApiAiAdaptiveCardExtension

Based on analysis of the code, I need to implement the following minimal changes to support the new CardResponseSemanticProperties interface:

• Analyze existing code structure and patterns
• Add SubTitle property to OpenApiAiAdaptiveCardExtension class
• Add ThumbnailUrl property to OpenApiAiAdaptiveCardExtension class
• Add InformationProtectionLabel property to OpenApiAiAdaptiveCardExtension class
• Update Parse method to handle new properties in JSON parsing
• Update Write method to serialize new properties
• Update AdaptiveCardInfo record to include new properties
• Update AdaptiveCardMapper to pass new properties
• Update unit tests to cover new properties in parsing and serialization
• Update plugin generation tests if needed
• Verify all changes work correctly
• Add changelog entry
• Update changelog entry to reference issue Update the x-ai-adaptive-card extension schema to the latest supported one #6934

The new properties to add are:

• subTitle?: string; ✅ Added as Subtitle
• thumbnailUrl?: string; ✅ Added as ThumbnailUrl
• informationProtectionLabel?: string; ✅ Added as InformationProtectionLabel

Note: title and url properties already exist in the current implementation.

Changes Made:

• ✅ Added three new optional string properties to OpenApiAiAdaptiveCardExtension class
• ✅ Updated Parse method to handle these properties from JSON with appropriate snake_case naming (subtitle, thumbnail_url, information_protection_label)
• ✅ Updated Write method to serialize these properties with correct naming conventions
• ✅ Updated AdaptiveCardInfo record to include the new properties as optional parameters
• ✅ Updated AdaptiveCardMapper to pass the new properties to the record
• ✅ Added comprehensive test coverage for parsing and serialization with all properties
• ✅ Verified syntax and naming conventions are correct using test compilation
• ✅ Ensured backward compatibility with existing functionality
• ✅ Added changelog entry documenting the new feature
• ✅ Updated changelog entry to reference issue Update the x-ai-adaptive-card extension schema to the latest supported one #6934

Summary:

All requirements have been successfully implemented with minimal changes that maintain backward compatibility. The new properties are optional and follow the existing patterns in the codebase for naming conventions, parsing, and serialization. A changelog entry has been added to document this new feature and references the related issue #6934.

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