feat(py): add define_resource for mcp plugin

[MengqinShen]

CHANGELOG:

• Added 'Resource' action kind
• Added a define_resource method to the Genkit class
• Created a resource management module - genkit/blocks/resource.py
• Added test files test_resource.py and resource_test.py

[gemini-code-assist]

Summary of Changes

Hello @MengqinShen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a fundamental new capability to the Genkit Python SDK: the concept of 'resources'. These resources represent addressable content or data processing units, identified by URIs, and can be either static or dynamically resolved using URI templates. The changes provide a robust mechanism for defining, registering, and retrieving various forms of unstructured data within the Genkit framework, enhancing its ability to integrate and manage diverse data sources.

Highlights

• New 'Resource' Action Kind: Introduced a new RESOURCE type within the ActionKind enum, enabling the Genkit framework to define and manage addressable content or data processing units.
• Resource Definition API: Added a define_resource method to the Genkit class, allowing users to register resources with the framework. This method takes options (like URI or template) and a function to implement resource content retrieval.
• Resource Management Module: A new module, genkit/blocks/resource.py, has been created. It provides core functionalities for defining, matching, and resolving resources, including support for URI templates (e.g., file://{path}) and handling metadata for resource content parts.
• Flexible Action Registration: The Registry class now includes a register_action_from_instance method, which allows pre-configured Action objects (like those created by dynamic_resource) to be registered, enhancing flexibility in how actions are managed.
• Comprehensive Testing: New test files (test_resource.py and resource_test.py) have been added to thoroughly validate the new resource definition, resolution, and matching logic, including static, template-based, and dynamic resource scenarios.

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[gemini-code-assist]

Code Review

This pull request introduces a new resource action type to Genkit, providing a way to define and manage addressable content. The changes include adding the resource kind, implementing the core logic for defining and looking up resources in a new resource.py module, and adding corresponding tests. The implementation is solid, but I have a few suggestions to improve code clarity, maintainability, and testing practices. My feedback includes removing commented-out code, improving type hints, preserving original stack traces in exceptions, avoiding access to private members, and simplifying the test setup.