Add S3 event optional fields

[yhamano0312]

Is your feature request related to a problem? Please describe.
I want to create a Lambda function to handle S3 events. However, the existing S3 event struct doesn't include some optional fields (e.g., replicationEventData) that are defined in the AWS documentation.
https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-content-structure.html

Describe the solution you'd like
I'd like to add the missing optional fields to the existing S3 event struct to match the complete event structure documented by AWS.

Describe alternatives you've considered
Defining my own struct that includes these fields.