feat(provider): implement unleash provider

[kikihakiem]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @kikihakiem, 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 new OpenFeature provider for Unleash, a popular feature management platform. This implementation allows Python applications to seamlessly integrate with Unleash for managing feature flags and tracking user interactions. The provider handles initialization, flag evaluation for various data types, event propagation, and conversion of OpenFeature contexts to Unleash-compatible formats. It aims to provide a robust and well-tested solution for feature flagging within the OpenFeature ecosystem.

Highlights

• New Unleash Provider Implementation: This PR introduces a new OpenFeature provider specifically designed for Unleash, enabling seamless integration of feature flag management into Python applications. It includes the core UnleashProvider class, responsible for initializing the Unleash client and managing its lifecycle.
• Robust Flag Evaluation Capabilities: The provider now supports comprehensive flag evaluation for all OpenFeature types: boolean, string, integer, float, and object. It leverages Unleash's is_enabled for boolean flags and get_variant for other types, ensuring accurate resolution based on configured strategies and contexts.
• Enhanced Event Management: Event handling has been integrated, allowing the provider to emit OpenFeature PROVIDER_READY, PROVIDER_ERROR, and PROVIDER_CONFIGURATION_CHANGED events. This ensures that applications can react to changes in the provider's state and flag configurations.
• Integrated Tracking Support: The provider now includes support for OpenFeature's track functionality, converting application-level tracking events and evaluation contexts into Unleash impression events. This enables A/B testing and analytics within the Unleash platform.
• Extensive Testing and Validation: Comprehensive test coverage has been added, including unit tests for individual components (events, flag evaluation, provider core) and integration tests. The integration tests utilize testcontainers to spin up a real Unleash server and PostgreSQL database, ensuring end-to-end functionality verification.

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[gemini-code-assist]

Code Review

This pull request introduces a new Unleash provider for OpenFeature, which is a great addition. The implementation is well-structured with a clear separation of concerns for event handling, flag evaluation, and tracking. The inclusion of comprehensive unit and integration tests using testcontainers is excellent and ensures the provider's reliability. I've provided a few suggestions to improve documentation clarity, enhance error handling, and correct some logic in the flag evaluation process. Overall, this is a solid contribution.