fix(grpc): Fix missing extensions from protobuf

[agilyol]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @agilyol, 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 addresses a bug in the protobuf utility functions where message extensions were not being correctly extracted and passed during the conversion of a2a_pb2.Message objects. The change ensures that the extensions field is properly handled, preventing data loss and improving the accuracy of message processing within the system.

Highlights

• Protobuf Message Handling: Corrected an issue where extensions from protobuf messages were not being properly included when converting a2a_pb2.Message to types.Message. This ensures that all relevant message data, including extensions, is correctly processed.

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[gemini-code-assist]

Code Review

This pull request correctly adds the missing extensions field when converting a protobuf Message to a types.Message. This is a good fix for deserialization.

However, the fix appears to be incomplete. The extensions field is also missing in the serialization direction, from types.Message to a2a_pb2.Message in the ToProto.message method. Additionally, both types.Artifact and a2a_pb2.Artifact define an extensions field, but the conversions are missing in both ToProto.artifact and FromProto.artifact methods. It would be beneficial to address these missing conversions for consistency and completeness.

I've added a minor suggestion to make the current change more concise.