feat: add default user agent for grpc

[Pulkit0110]

Adding a default gcloud-python/{version} for grpc client just like the json client

[gemini-code-assist]

Summary of Changes

Hello @Pulkit0110, 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 crucial enhancement by ensuring that all gRPC client requests originating from the 'google-cloud-storage' library include a standardized user agent string. This change provides consistent client identification across different protocols, which is vital for service-side logging, analytics, and debugging, allowing for better tracking of client library usage and potential issues.

Highlights

• Standardized User Agent: Implements a default 'gcloud-python/{version}' user agent for gRPC clients, aligning with existing JSON client behavior.
• ClientInfo Handling: Modifies the AsyncGrpcClient constructor to ensure 'client_info' is always initialized and correctly appends the library version to the user agent string.
• Test Coverage: Updates unit tests to verify that the new user agent string is correctly set and passed to the underlying gRPC client.

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[gemini-code-assist]

Code Review

This pull request adds a default user agent to gRPC client requests, which is a valuable addition for usage tracking. The implementation is mostly correct, but I've identified a minor issue in how the user agent string is constructed and a flaw in one of the accompanying tests. My review includes suggestions to improve the robustness of the user agent logic and to correct the test, ensuring the new functionality is validated properly. The provided rules did not necessitate any modifications or removals of the existing comments.