Metrics and Constraints Release

✨ Features

• sketch model metrics for classification #153 [@lalmei]
• create. and apply constraints to datasets #152 [@cswarth]
• bounding boxes data tracking #134 [@lalmei]
• track full local datasets #134 [@lalmei]

🐛 Bug Fixes

• refactor track() -> update() #158 [@cswarth]
• add python version reqs #136 [@lalmei]

📚 Documentation

• 📚 added code of conduct #142 [@lalmei]

⬆️ Dependencies

• Migrate to datasketches 2.2.0b1 #151 [@andyndang]
• Bump cryptography from 3.2.1 to 3.3.2 #150 [@dependabot]
• Update outdated requirements #141 [@lalmei]

⬇️ Dependencies

• remove a dependency on bleach #144 [@lalmei]
• Remove s3fs refs and use smart open instead #140 [@lalmei]

🚨 Testing

• 🚀 added release drafter #143 [@lalmei]