New gpt-image-1 model for openai_conversation.generate_image action

[Shulyaka]

Proposed change

1. Latest image model gpt-image-1 for openai_conversation.generate_image action. Blog post: https://openai.com/index/image-generation-api, API reference: https://platform.openai.com/docs/api-reference/images/create
2. Updated action parameters to support the new model features.
3. The action parameters are backwards compatible, but a repair issue is created if deprecated parameters are used.
4. Because OpenAI requires verification for some users to use gpt-image-1, the PR implements a fallback to the current dall-e-3 model. A repair issue is created in this case to let the user know about the verification. We will remove this failover if/when OpenAI opens full access to gpt-image-1
5. The images are now saved in local media files, and the url that the action returns is now a HA url instead of an OpenAI-hosted url.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue:
• This PR is related to issue:
• Link to documentation pull request: New gpt-image-1 model for openai_conversation.generate_image action home-assistant.io#38826
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• The code change is tested and works locally.
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[home-assistant]

Hey there @balloob, mind taking a look at this pull request as it has been labeled with an integration (openai_conversation) you are listed as a code owner for? Thanks!

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[Shulyaka]