Add name attribute to outputs.tf to allow easy composite alarm creation

[swirle13]

Is your request related to a new offering from AWS?

Is this functionality available in the AWS provider for Terraform? See CHANGELOG.md, too.

• Yes ✅: please list the AWS provider version which introduced this functionality

v3.24.0

Is your request related to a problem? Please describe.

I'm attempting to create a composite alarm from multiple cloudwatch metric alarms. Terraform documentation shows the way to insert these values like so:

resource "aws_cloudwatch_composite_alarm" "example" {
  alarm_description = "This is a composite alarm!"
  alarm_name        = "example-composite-alarm"

  ...

  alarm_rule = <<EOF
ALARM(${aws_cloudwatch_metric_alarm.alpha.alarm_name}) OR
ALARM(${aws_cloudwatch_metric_alarm.bravo.alarm_name})
EOF

...
}

where each alarm is referenced by its name. I am unable to reference the name of each alarm that I've created via /modules/metric-alarm as it only has outputs cloudwatch_metric_alarm_arn and cloudwatch_metric_alarm_id

Describe the solution you'd like.

When creating multiple cloudwatch metric alarms, I would like to be able to reference them in creation of the composite alarm.

module "metric_alarm1" {
  source  = "myrepo/modules/metric-alarm"
  version = "0.0.2"

  alarm_name        = "alarm1"
  ...
}

module "metric_alarm2" {
  source  = "myrepo/modules/metric-alarm"
  version = "0.0.2"

  alarm_name        = "alarm2"
  ...
}

module "composite_alarm" {
  source  = "myrepo/modules/composite-alarm"
  version = "0.0.2"
  ...
  alarm_rule = <<EOF
ALARM(${module.metric_alarm1.alarm_name}) OR
ALARM(${module.metric_alarm2.alarm_name})
EOF

}

Describe alternatives you've considered.

Currently, I have to not use the metrics-alarm submodule and use TF resource aws_cloudwatch_metric_alarm directly in order to reference cloudwatch metric alarm name.

Additional context