ApplicationAutoScaling CloudWatch alarm tags

### Name of the resource

AWS::ApplicationAutoScaling::ScalingPolicy

### Resource name

_No response_

### Description

When creating a `AWS::ApplicationAutoScaling::ScalingPolicy` this creates a CloudWatch alarm in the background based on the `TargetTrackingScalingPolicyConfiguration`.

I would like to be able to pass the `Tags` attribute to the `ScalingPolicy` and have this propagate to all resources created under the hood, where I can not explicitly set the `Tags` attribute.
An alternative would be to add the option to specify tags in the `TargetTrackingScalingPolicyConfiguration` and have that propagate to the CloudWatch Alarm(s) created.

Currently it is not possible (that I can see) to tag the CW alarms created for the `AWS::ApplicationAutoScaling::ScalingPolicy` which means there is no way to find out where this originates from in the cost explorer.

### Other Details

_No response_

Start by reviewing the AWS::ApplicationAutoScaling::ScalingPolicy resource and its TargetTrackingScalingPolicyConfiguration. The issue proposes propagating Tags to the CloudWatch alarms created under the hood, either from ScalingPolicy or its target-tracking configuration. Done means users can identify those alarms in Cost Explorer by applying the requested tags.

Written by the indexing model from the issue text.