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Add retry step to providers and implement integration tests

- Integrated the `ReqLLM.Step.Retry` step into the Amazon Bedrock, Anthropic, and Google providers to handle transient network errors more effectively.
- Created a new integration test suite for the retry functionality, ensuring consistent retry behavior across all three providers.
- Verified that retry options are correctly configured and that the retry function accurately identifies retryable errors.

These enhancements improve the robustness of API interactions by allowing automatic retries for transient issues.