feat(grpc_user_agent): send user_agent to grpc channel

[chandra-siri]

• feat(async_grpc_client): send user_agent to grpc channel by providing it as channel arg - "grpc.primary_user_agent".
  * This will send "user_agent" to all RPC calls.

[gemini-code-assist]

Summary of Changes

Hello @chandra-siri, 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 enhances the asynchronous gRPC client for Google Cloud Storage by implementing a mechanism to consistently send a user_agent string with all gRPC API requests. This is achieved by configuring the gRPC channel with the grpc.primary_user_agent option, which is derived from either a user-provided client_info or a default value. This improvement ensures better client identification and telemetry for API interactions.

Highlights

• User-Agent Propagation: The primary change introduces the capability to send a user_agent string to the gRPC channel, ensuring that all RPC calls made through the asynchronous gRPC client include this identifier.
• Channel Configuration: The user_agent is now passed as a channel argument, specifically grpc.primary_user_agent, during the creation of the gRPC channel.
• Default Client Information: If no specific client_info is provided by the user, the system will now automatically use a DEFAULT_CLIENT_INFO to construct the user_agent string.
• Enhanced Test Coverage: New and updated unit tests have been added to validate that the user_agent is correctly configured and passed to the gRPC channel under various scenarios, including default and custom client_info.

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[gemini-code-assist]

Code Review

This pull request correctly implements sending the user_agent to the gRPC channel by providing it as a channel argument. The changes are logical, and the accompanying tests are well-written to cover the new functionality. I have a couple of minor suggestions for code cleanup and to ensure documentation accuracy.