Feature request: Add AppSync Resolver Event Schema to Parser

[leandrodamascena]

Use case

Original issue in TypeScript: aws-powertools/powertools-lambda-typescript#3283

We need to add a new model for AppSync Resolver Events described here - https://docs.aws.amazon.com/appsync/latest/devguide/resolver-context-reference.html

Solution/User Experience

It would work like any of the other built-in schemas that Powertools currently supports: https://docs.powertools.aws.dev/lambda/python/latest/utilities/parser/#built-in-models

Alternative solutions

Acknowledgment

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

[leandrodamascena]

We have several examples of expected events here: https://github.com/aws-powertools/powertools-lambda-python/blob/develop/tests/events/appSyncResolverEvent.json.