Support Invocation schema version 2 for S3 Batch Operations

[mmerfort]

The event looks a bit different with Invocation Schema version 2 of the S3 Batch Operations than with version 2.
It uses the name instead of a bucket ARN and adds user arguments, which can be specified during job creation.

More information: https://aws.amazon.com/blogs/storage/automate-object-processing-in-amazon-s3-directory-buckets-with-s3-batch-operations-and-aws-lambda/

The Job and Task subclasses of the S3BatchEvent class are unsuitable for version 2: https://github.com/aws/aws-lambda-java-libs/blob/main/aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/S3BatchEvent.java#L28-L47

The Golang SDK has already added the new event types, and something similar would be nice for this project.
Reference: https://github.com/aws/aws-lambda-go/blob/main/events/s3_batch_job.go#L26-L46

[mmerfort]

Fixed in #496