Add FastFlow model training testing inference via Anomalib API

[samet-akcay]

Description

• This notebook demonstrates how to train FastFlow model, test and deploy afterwards using the anomalib api.

• Fixes Add documentation for dataset preparation/model preparation/model evaluation #258

Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• My code follows the pre-commit style and check guidelines of this project.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes

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[ashwinvaidya17]

Since benchmarking.ipynb is renamed, README should be updated to point to the new location. Also, it would be nice to add falsflow notebook to the README as well.