Warning printed from AI SDK

[FrankChen021]

Thanks for your work.

I got a warning:

AI SDK Warning (githubcopilot.chat / gpt-4o): The feature "responseFormat" is not supported. JSON response format schema is only supported with structuredOutputs

The warning is from open ai compatible provider.

The OpenAICompatibleChatLanguageModel provides a props supportsStructuredOutputs which allows users to eliminate this warning.
I think GitHubCopilotProviderSettings should expose this setting, or inside the provider we set this property to true.