(aws-lambda): IAlias "metrics" function returns metrics for function instead of alias

### What is the problem?

IAlias "metrics" function returns metrics for function instead of alias.

### Reproduction Steps

```
const alias = Alias.fromAliasAttributes(this, lambdaName, {
aliasName: 'live',
aliasVersion: Version.fromVersionArn(this, `${lambdaName}version`,`${lambdaArn}:1`),
});

alias.metricInvocations();
```

### What did you expect to happen?

The metric returned should be for the alias.

Source on dashboard should look like this:
```
[ "AWS/Lambda", "Invocations", "FunctionName", "MyLambda", "Resource", "MyLambda:live", { "accountId": "281910761090", "region": "ap-southeast-2", "stat": "Sum", "visible": false, "id": "countSYD" } ],
```

### What actually happened?

The metric returned was for the lambda instead of the alias

[ "AWS/Lambda", "Invocations", "FunctionName", "MyLambda", { "accountId": "281910761090", "region": "ap-southeast-2", "stat": "Sum", "visible": false, "id": "countSYD" } ],

### CDK CLI Version

1.143.0

### Framework Version

1.139.0

### Node.js Version

16

### OS

Mac OS

### Language

Typescript

### Language Version

3.6.4

### Other information

The issue could be fixed by adding the correct metric function here: https://github.com/aws/aws-cdk/blob/v1.144.0/packages/@aws-cdk/aws-lambda/lib/alias.ts#L92

Or by adding the correct metric function here: https://github.com/aws/aws-cdk/blob/v1.144.0/packages/%40aws-cdk/aws-lambda/lib/function-base.ts#L489

Start by reading packages/@aws-cdk/aws-lambda/lib/alias.ts around the linked metric function and compare it with packages/@aws-cdk/aws-lambda/lib/function-base.ts. Reproduce alias.metricInvocations() with the provided example and inspect the generated dashboard metric. Done means the metric includes the alias Resource dimension rather than only the function dimensions.

Written by the indexing model from the issue text.