Add permissions boundary aws iam role

[edersonbrilhante]

In my case, my AWS account I am using permissions boundary to avoid creating a new role with bigger permissions. So any new role must set these permissions.
To run the resource aws_iam_role. rds_enhanced_monitoring, it is needed to set these permissions boundary.
Example:

resource "aws_iam_role" "rds_enhanced_monitoring" {

  name               = "rds-enhanced-monitoring-${var.name}"
  assume_role_policy = data.aws_iam_policy_document.monitoring_rds_assume_role.json

  permissions_boundary = var.permissions_boundary
}

[bryantbiggs]

Closed with #104

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