feat: Detailed flag evaluation

[NeaguGeorgiana23]

This PR

• Implements detailed flag evaluation methods (GetBooleanDetails, GetStringDetails, GetIntegerDetails, GetDoubleDetails, GetObjectDetails) in the Features interface and ClientAPI class as mentioned in OpenFeature Specification Requirement 1.4.1.
• Returns typed FlagEvaluationDetails<T> (BoolFlagEvaluationDetails, StringFlagEvaluationDetails, IntFlagEvaluationDetails, DoubleFlagEvaluationDetails, ObjectFlagEvaluationDetails) populating flag_key, value, reason, variant, flag_metadata, error_code, and error_message.
• Updates Bazel BUILD dependencies for features, client_api, and client_api_test.
• Adds unit tests in test/client_api_test.cpp verifying all detailed evaluation overloads, provider metadata and variant propagation, and error state handling.

Related Issues

Fixes #73

Notes

• The detailed evaluation methods encapsulate provider resolution results along with invocation parameters into FlagEvaluationDetails<T> value objects while maintaining exception safety guarantees.

Follow-up Tasks

• Implement the hook execution lifecycle pipeline (before, after, error, finally) inside ClientAPI::EvaluateFlag.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c2fee2ac-dfc8-4b70-8128-fb0422479517

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}