[GitHub] Add RetryInterceptor

[joshuawright11]

Implements a retry interceptor for handling failed requests in the Papyrus library. This addition allows requests to be retried based on configurable conditions, enhancing the robustness of network communication.

• Introduces RetryInterceptor class: Adds a new class that implements the Interceptor protocol, enabling retry logic for failed requests. This class allows configuration of retry conditions, maximum retry count, and retry delay.
• Updates Provider to support retry interceptor: Modifies the Provider class to accept an optional RetryInterceptor instance. This change integrates the retry mechanism into the request flow, allowing failed requests to be retried according to the specified conditions.
• Enhances unit tests: Extends ProviderTests with a new test case that verifies the functionality of the retry interceptor. This test ensures that requests failing with a specified status code are retried as expected.
• Documents retry interceptor usage: Updates the README.md file with instructions on configuring and using the retry interceptor. This documentation provides users with the necessary information to leverage the new feature.

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