feat(experimental): Add base resumption strategy for bidi streams

[Pulkit0110]

This PR contains abstract base class for different resumption strategies for bidi streams

[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 abstract base class, _BaseResumptionStrategy, designed to standardize how bidirectional streaming operations handle resumption and retry logic. This class provides a clear interface for implementing service-specific strategies, allowing for a more modular and robust retry mechanism for bidi streams by separating common retry loops from operation-specific state management and request generation.

Highlights

• New Abstract Base Class: Introduced _BaseResumptionStrategy, an abstract base class for defining resumption strategies for bidirectional streams.
• Standardized Interface: This class provides a standardized interface with abstract methods for generate_requests, update_state_from_response, and recover_state_on_failure.
• Pluggable Strategy: The design aims to allow for pluggable, service-specific logic within a generic retry manager, enhancing modularity for bidi stream operations.

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[gemini-code-assist]

Code Review

This pull request introduces an abstract base class _BaseResumptionStrategy for handling bidi stream resumption logic. The design is sound, providing a clear interface for pluggable strategies. My review includes suggestions to improve type hinting and adhere to modern Python docstring conventions for better code clarity and maintainability.