- ChatGenerationMetadata provides Map for additional metadata
- Add Builder interface and DefaultChatGenerationMetadataBuilder
- Add DefaultChatGenerationMetadata implementation
- Update all AI model implementations to use the new builder pattern
- Deprecate ChatGenerationMetadata.from() factory method
- Remove commented out legacy code from ChatGenerationMetadata interface
- Make metadata and content filter collections immutable via Collections.unmodifiableSet()
- Add null validation in DefaultChatGenerationMetadata constructor
- Improve toString() method with more informative output
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