refactor(js/plugins/anthropic): extract out some shared converters

[cabljac]

This PR restructures code a bit to extract out some shared logic, using structural types to keep them agnostic wrt the SDK namespaces.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the Anthropic plugin's runner logic by extracting shared content block and delta conversion functionalities into new, dedicated converter modules. This change aims to improve code organization, reduce redundancy, and enhance the maintainability of the Anthropic API integrations by centralizing common conversion patterns and leveraging structural typing for broader applicability across different API versions.

Highlights

• Extracted Shared Converters: Common logic for converting Anthropic content blocks and deltas has been moved into new, dedicated converters/shared.ts and converters/beta.ts modules.
• Improved Code Reusability: Centralized conversion functions reduce duplication across base.ts, beta.ts, and stable.ts runner implementations.
• Enhanced Maintainability: The BaseRunner, BetaRunner, and StableRunner classes are simplified by delegating conversion responsibilities to specialized modules.
• Structural Typing for Agnostic Converters: Structural types are utilized to ensure the new converter functions are agnostic to specific SDK namespaces, promoting flexibility and broader applicability.

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[gemini-code-assist]

Code Review

This pull request is a well-executed refactoring that extracts shared logic for converting Anthropic API objects into Genkit parts. By moving this logic into a new converters directory with shared, beta, and stable modules, the code is now more organized, easier to maintain, and has less duplication. The use of structural typing in the shared converters to support both stable and beta SDKs is a great design choice. Overall, these changes significantly improve the codebase's structure. I have one minor suggestion to further improve conciseness in one of the new helper functions.