Introduces a new API key management system that allows users to customize how
API keys are provided and managed in their Spring AI applications. This
change improves security and flexibility by:
- Adding core ApiKey interface and SimpleApiKey implementation
- Introducing @OpenAiApiKey qualifier for bean disambiguation
- Supporting custom API key providers for secure key management
- Adding auto-configuration support for API key injection
- Adding builder pattern for OpenAiApi configuration
- Deprecating public constructors in favor of builder API (since 1.0.0.M6)
The new system enables users to implement their own key management
strategies while maintaining backward compatibility with property-based
configuration.
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