Methods `toAttributeValueMapV1` and `toAttributeValueMapV2` should be public

[carlzogh]

I've added a comment to the DynamodbAttributeValueTransformer, the toAttributeValueMapV1 should be public as well I believe, since what you get from a KinesisEvent.KinesisEventRecord is an old and a new image each as a Map of AttributeValues

Originally posted by @jente-peeraer-cloudway in #182 (comment)

[carlzogh]

@jente-peeraer-cloudway this is now available in aws-lambda-java-events-sdk-transformer version 3.0.1 - thanks for bringing this up!