Extend with DynamoDB for metadata + Step Function to orchestrate the flow

[ahsan-ikram]

Use Stroy

1. User uploads the images
2. When user refresh page, he see image metadata and thumbnail

Distributed Workflow

1. Use sign-in using AWS cognito
2. User upload image via frontend which uploads image to S3
3. S3 uploads trigger a lambda to start step function
4. Step function runs serverless-thumbnailizer lambda
5. serverless-thumbnailizer function, stores calculates images metadata and image thumbnails
6. Metadata is stored in DynamoDB and thumbnail in S3
7. Frontend get metadata from DynamoDb and thumbnail from S3