Add support for OpenAI Responses API #1428
Description
OpenAI recommends the use of Responses API instead of Chat Completions for new projects. Let's add support for it for all OpenAI-related plugins so that we support both chat completions and responses. More information https://platform.openai.com/docs/guides/migrate-to-responses
Update:
- LanguageModelFailurePlugin
- LanguageModelRateLimitingPlugin
- OpenAITelemetryPlugin
- OpenAIUsageDebuggingPlugin
- OpenAIMockResponsePlugin