Add table aws_ecr_registry

[chammock]

Add a table to get AWS ECR Private Registry information. Example use case is querying replication configuration and policy applied to the registry.

References

• https://docs.aws.amazon.com/AmazonECR/latest/userguide/Registries.html
• https://docs.aws.amazon.com/AmazonECR/latest/APIReference/API_DescribeRegistry.html