feat: console @ai-sdk generation warnings

[yusuf-eren]

example warning log with @ai-sdk/[email protected]

@ai-sdk generation {
  type: 'unsupported-setting',
  message: 'Unknown warning',
  details: 'JSON response format is not supported.',
  model: {
    modelId: 'claude-3-7-sonnet-20250219',
    version: 'v1',
    provider: 'anthropic.messages',
    supportsStructuredOutputs: undefined
  }
}

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[yusuf-eren]

Hey @seratch , should I add changesets to this PR?

[seratch]

I haven't made sure if this change is really useful but yes, a changeset file is necessary if it gets merged.

[dkundel-openai]

@yusuf-eren does the AI SDK log those warnings out by default? If not I would say let's keep the same behavior they have and not log them out automatically. At least not on a warn level. I'd be okay with having them at a debug level. Otherwise they should be available under modelResponse.providerData.warnings for people to handle them themselves. An entry in the docs could be helpful for that.