feat(anthropic): add support for Genkit v2 streaming API

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Add Support for Genkit v2 Streaming API

Summary

This PR updates the Anthropic plugin to support the new Genkit v2 streaming API, which introduces a more structured approach to handling streaming requests and abort signals.

Changes

API Updates

• Updated streaming callback interface: Migrated from a simple callback function to the new v2 API format with streamingRequested, sendChunk, and abortSignal parameters
• Added apiVersion: 'v2': Specified the API version in the model definition for compatibility with Genkit v2
• Integrated AbortSignal support: Properly pass AbortSignal to Anthropic SDK client calls to enable request cancellation

Code Improvements

• Fixed indentation inconsistencies in toAnthropicToolResponseContent and fromAnthropicContentBlockChunk functions for better code readability
• Updated all relevant test cases to reflect the new API structure

Breaking Changes

⚠️ BREAKING CHANGE: This update changes the streaming callback interface to align with Genkit v2 API. Projects using the old streaming callback format will need to update their code to use the new interface structure.

Migration Guide

Before (v1 API):

await model.generate(request, (chunk) => {
  // Handle chunk
});

After (v2 API):

await model.generate(request, {
  streamingRequested: true,
  sendChunk: (chunk) => {
    // Handle chunk
  },
  abortSignal: controller.signal
});

Testing

• ✅ All existing tests pass
• ✅ Test coverage remains at 95.76%
• ✅ Updated test cases to verify new API functionality

Checklist

• Code changes follow the project's coding standards
• Tests have been updated/added
• All tests pass locally
• Documentation has been updated (if applicable)
• Breaking changes are clearly documented

Related Issues

This change is part of the broader ecosystem update to support Genkit v2 API across all plugins.

Additional Context

This update ensures the Anthropic plugin remains compatible with the latest Genkit framework version while providing better support for request cancellation through AbortSignal integration.

[xavidop]

Builds are failing

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@xavidop PTAL 🙏

[xavidop]

it is still failing

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Fixed build error (f831182).

it seems that there is no @nx/nx-linux-x64-gpu, but is @nx/nx-linux-x64-gnu. 😅