Add image generation

[sebiweise]

• Implement OpenAI Dall-E
• Add new ai-model type prop ("text" or "image")
• Fix max-tokens.ts
• Display image instead of the url
• Update chat-params for image generation
• Implement some kind of context (currently only the last message will be send to Dall-E)

Current Example:

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[sebiweise]

Just added a issue with the optimizations that are still needed but the Image generation itself is working fine so I think we can push it and I will have a look at #146 later on 👍🏼