Feature request: Unmarshal DynamoDB fields when using DynamoDBStreamModel in the parser utility

[leandrodamascena]

Use case

Similar to what we did in the Event Source Data Class - (https://github.com/aws-powertools/powertools-lambda-python/pull/1619), when customers are using DynamoDBStreamModel, we can unmarshal the values and create a better experience for customers to access the old_image and new_image attributes.

Solution/User Experience

Unmarshal values in the old_image and new_image attributes

Alternative solutions

No response

Acknowledgment

• [X] This feature request meets Powertools for AWS Lambda (Python) Tenets
• [X] Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET