fix: Fix reference to grpc.aio.ServicerContext

[mikeas1]

Description

Fix references in a2a/server/request_handlers/grpc_handler.py to grpc.aio.ServicerContext. The import for grpc.aio was missing and various functions incorrectly referenced grpc.ServicerContext.

This is a backwards compatible change, it's just typing annotations for internal functions that were off. The actual code itself worked, as can be demonstrated by running the sample agent in a2aproject/a2a-samples/samples/python/agents/dice_agent_grpc.

[gemini-code-assist]

Summary of Changes

Hello @mikeas1, 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 primarily focuses on improving the type correctness and clarity of gRPC asynchronous servicer contexts within grpc_handler.py. By adding a previously missing import and updating several type annotations, the code now more accurately reflects the asynchronous nature of its gRPC interactions, enhancing static analysis and maintainability without introducing any behavioral changes to the application.

Highlights

• Type Annotation Correction: Updated type annotations for ServicerContext parameters from grpc.ServicerContext to grpc.aio.ServicerContext in methods like build within CallContextBuilder and DefaultCallContextBuilder, and in abort_context. This ensures correct typing for asynchronous gRPC operations.
• Missing Import Added: Added the necessary import grpc.aio statement to support the corrected asynchronous gRPC type annotations, resolving a previous omission.
• Code Style Refinement: Adjusted the import style for AgentCard and TaskNotFoundError from a2a.types to a more concise single-line format.

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[gemini-code-assist]

Code Review

This pull request correctly fixes the type annotations for grpc.aio.ServicerContext in src/a2a/server/request_handlers/grpc_handler.py. The changes, including adding the grpc.aio import and updating the type hints in various method signatures, are accurate and necessary for correct static analysis in an async gRPC context. The PR is well-focused and effectively resolves the described issue. The code quality is good, and I have no recommendations for changes.