AWS::Events::Rule - GetAtt for Rule Name

### Name of the resource

AWS::Events::Rule

### Resource name

_No response_

### Description

For `AWS::Events::Rule`, CloudFormation [supports](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-events-rule.html#aws-resource-events-rule-return-values) `!Ref` to return the Rule ID and `!GetAtt` to return the Rule `Arn`.

There are cases where the Rule's name is required. For example, CloudWatch metrics for `AWS::Events::Rule` use the rule name as a dimension. The name can be extracted from the Rule's ID, which takes format `|`. Given Rule `MyEventBridgeRuleResource`, we get the name like as follows:

```yaml
!Select [1, !Split ['|', !Ref MyEventBridgeRuleResource]]
```

Whilst the above is a sufficient workaround for now, may `GetAtt` be extended to support name retrieval in addition to ARN?

```yaml
!GetAtt MyEventBridgeRuleResource.Name
```

Start with the issue's AWS::Events::Rule resource and the linked CloudFormation return-values documentation. Investigate where CloudFormation resource attributes are defined and how GetAtt support is assessed; the work is done when Name retrieval is supported or the requested coverage decision is recorded.

Written by the indexing model from the issue text.