Summary of Changes

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This pull request introduces an experimental feature to enhance the resilience and efficiency of bidirectional read operations by implementing a structured approach to stream resumption. It establishes an abstract framework for handling various bidi operations and provides a specific strategy for reads that intelligently manages download state and, crucially, extracts routing tokens from redirection errors to facilitate seamless recovery.

Highlights

• Introduced Abstract Resumption Strategy: A new abstract base class _BaseResumptionStrategy is added to define a common interface for handling bidi stream resumption, allowing for pluggable, service-specific logic.
• Implemented Bidi Read Resumption: A concrete implementation, _ReadResumptionStrategy, is provided for bidi read operations, managing download state, generating read requests, and processing server responses.
• Handled BidiReadObjectRedirectedError: The _ReadResumptionStrategy now includes logic to specifically catch BidiReadObjectRedirectedError during failure recovery and extract the routing_token to update the operation's state.
• Added Comprehensive Unit Tests: New unit tests were introduced to validate the functionality of the _DownloadState helper class and the _ReadResumptionStrategy, including tests for request generation, state updates, data corruption scenarios, and the new error redirection handling.

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