Provider Version 2.x.x support, enabled_metrics, and new outputs

• Add IAM role outputs (#38)

  • Outputs a map with the IAM role's name and arn

• Output ecs security group (#45)

• Allow setting enabled_metrics (#39)

• fixes compatibility with aws provider v2, refactors data.aws_ami.ecs_ami to use owners instead of filter on owner-alias (#43)