feat(docvision): add retry mechanism to predict_layout

[awwaawwa]

This PR adds a retry mechanism to the predict_layout function in the document vision module.

Changes:

• Implement retry logic using the tenacity library
• Add exponential backoff strategy with 3 retry attempts
• Add proper logging for retry attempts
• Add tenacity dependency to pyproject.toml

Benefits:

• Improves reliability when the document layout service is temporarily unavailable
• Prevents immediate failure when network issues occur
• Uses industry standard patterns for retry with exponential backoff