Issue #495

Description of changes:

Add a new S3BatchEventV2 class representing an Event coming from S3 when using invocation schema version 2.
Compared to the other version, it adds the user arguments and changes the bucket ARN to the name.

Target (OCI, Managed Runtime, both):
Unsure yet

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.