Update preset map for VGG model

[sonali-kumari1]

This PR updates the VGG model preset keys to align with the official naming convention used in Keras and Kaggle documentation.

[gemini-code-assist]

Summary of Changes

Hello @sonali-kumari1, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on standardizing the naming conventions for VGG model preset keys within the PRESET_MAP. By updating these keys to include an _imagenet suffix, the project aligns its internal naming with the official conventions found in Keras and Kaggle documentation, enhancing consistency and making it easier for users to identify and utilize the correct model presets.

Highlights

• Preset Map Key Renaming: The keys within the PRESET_MAP for VGG models have been updated to align with official naming conventions. For example, vgg11 is now vgg_11_imagenet.
• Standardization: This change ensures consistency with the naming conventions used in Keras and Kaggle documentation, improving clarity and maintainability.

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[gemini-code-assist]

Code Review

This pull request updates the VGG model preset keys to align with the project's snake_case naming convention. The changes in tools/checkpoint_conversion/convert_vgg_checkpoints.py are correct and improve consistency across the codebase. My review includes one point of feedback regarding an outdated example in the documentation that should be updated to reflect these new preset names.

[sachinprasadhs]

LGTM, Thanks