The CognitoPreTokenGenerationV2Event does not adhere to the AWS documentation #1798

[Gidmark]

According to the the AWS documentation for the Pre token generation Lambda trigger the claims response of the CognitoPreTokenGenerationV2Event should be able to accept any one of [String, Number, Boolean, Array of strings, numbers, booleans, or a combination of any of these, JSON]. However, at the moment it just accepts a string map?
Is there any intention implement the documented specs?

There is the same issue in other libraries where this has been fixed: aws/aws-lambda-dotnet#1798