feat(optimizely)!: Optimizely provider concepts updates

[liran2000]

Align with Go provider, see discussion.

[gemini-code-assist[bot]]

Summary of Changes

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This pull request refactors the Optimizely Java provider to enhance its feature flag evaluation capabilities and align with the concepts established in the Go provider. The changes enable direct support for various data types in flag evaluations and introduce a flexible way to select specific variables within Optimizely flags, thereby improving the provider's functionality and consistency across different OpenFeature SDKs.

Highlights

• Direct Evaluation Support: The Optimizely provider now directly supports String, Integer, and Double flag evaluations, moving away from throwing UnsupportedOperationException for these types.
• Variable Key Selection: A new mechanism has been introduced to allow specifying a variableKey within the EvaluationContext to select a particular variable from an Optimizely feature flag, defaulting to 'value' if not specified.
• Updated Evaluation Logic: All evaluation methods (getBooleanEvaluation, getStringEvaluation, getIntegerEvaluation, getDoubleEvaluation, getObjectEvaluation) have been refactored to use specific Optimizely SDK getFeatureVariableX methods, improving precision and alignment with Optimizely's variable concepts.
• Enhanced Documentation and Tests: The README.md has been updated to reflect the new evaluation concepts, and comprehensive unit tests have been added and modified to cover the new functionality, including variableKey usage and default value handling.

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