feat(backend/blocks): Add google banana pro

[Bentlybro]

This PR adds the latest google banana pro image generator and editor to the platform and fixes up some of the prices for the image generation models

I asked for Generate a image of a dog on a skateboard and this is what i got:

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • Test the image generator and image editor block using the latest google banana pro model and it works

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-google-banana-pro

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[deepsource-io]

Here's the code health analysis summary for commits 0edc669..211933b. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Python	✅ Success		View Check ↗

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[AutoGPT-Agent]

Thank you for adding the Google Nano Banana Pro model to our platform! The implementation looks good overall, and I appreciate the example image demonstrating the model's capabilities.

A few observations about your PR:

1. The code changes look good - you've added the new model to the appropriate enums and implemented the necessary logic for image generation.

2. However, I noticed that while you've added cost configurations for AIImageGeneratorBlock and AIImageCustomizerBlock, these seem to be specifically for Replicate credentials. Since you're adding a new Google model (Nano Banana Pro), we should also define the appropriate cost configuration for this specific model.

Could you please add a cost configuration entry specifically for the Nano Banana Pro model? This will ensure proper cost tracking when users utilize this new model.

Other than that, the changes look good and focused on the stated goal of adding Google Banana Pro to our platform. Once you address the cost configuration, this PR should be ready to merge.