feat(experimental): add bidi stream retry manager.

[Pulkit0110]

Add bidi stream retry manager. It will the main class that would be responsible for retries.

[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 foundational component for enhancing the reliability of asynchronous bidirectional streaming operations within the google-cloud-storage library. By providing a dedicated retry manager, it enables robust handling of transient failures, ensuring that streaming operations can automatically recover and continue without manual intervention. This change is crucial for improving the overall stability and user experience of experimental asynchronous features.

Highlights

• New Bidirectional Stream Retry Manager: Introduced _BidiStreamRetryManager, a new class responsible for managing retry logic for asynchronous bidirectional streaming operations. This manager integrates with a _BaseResumptionStrategy to handle state management during retries and uses google.api_core.retry.AsyncRetry for defining retry policies.
• Robust Retry Mechanism: The _BidiStreamRetryManager's execute method orchestrates the retry loop, allowing for automatic re-attempting of streaming operations upon retriable exceptions. It supports resuming operations from a previous state and updating state based on responses, ensuring resilience against transient network issues or service unavailability.
• Comprehensive Unit Tests: Added a new test file test_bidi_stream_retry_manager.py with extensive unit tests for the _BidiStreamRetryManager. These tests cover various scenarios, including successful execution, retries on initial and mid-stream failures, handling of non-retriable errors, and proper behavior when retry deadlines are exceeded.

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[gemini-code-assist]

Code Review

This pull request introduces a _BidiStreamRetryManager for handling retries in bidi streaming operations, along with comprehensive unit tests. The overall implementation is solid and well-tested. I have a few suggestions to improve type safety and maintainability in bidi_stream_retry_manager.py, such as adding a missing type hint, making another one more specific, and pointing out the use of an internal attribute from google-api-core which could be a future maintenance risk. Please see my detailed comments.