feat(block): Add AI video generator block with Fal txt 2 vid

[Torantulino]

Background

Implements an AI Video Generator Block for text to image models hosted on Fal

[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

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[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪

🧪 PR contains tests

🔒 Security concerns API Key Exposure: The code handles sensitive FAL API keys. While the keys are stored using SecretStr, care should be taken to ensure they are not exposed in logs or error messages. The error handling at lines 188-199 could potentially leak API key information in the error message if the API response contains sensitive data.

⚡ Recommended focus areas for review Error Handling The error handling in the video generation process could be improved. The code catches general exceptions and converts them to error messages, but may not handle all edge cases like network timeouts or API rate limits appropriately. Resource Management The httpx client is created for each request without using a context manager or proper cleanup. Consider using 'with httpx.Client() as client' pattern for better resource management. Performance Concern The polling mechanism uses exponential backoff but could benefit from more sophisticated retry logic and connection pooling for better performance under load.