ecr: enable enhanced image scanning

### Describe the feature

Add CDK methods to enable enhanced image scanning for ECR repositories

https://docs.aws.amazon.com/AmazonECR/latest/userguide/image-scanning-enhanced.html

### Use Case

I would like to enable enhanced image scanning through CDK. The alternative route right now is to create a CFN stack using custom resources that invoke the AWS SDK.

### Proposed Solution

Enabling enhanced image scanning is account wide, so updating the [ImageScanningConfiguration Interface](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_ecr.CfnRepository.ImageScanningConfigurationProperty.html), which applies to a single repository, doesn't make much sense.

Instead, an ideal solution would be a top level method of `aws_ecr`, maybe something like:

```js
import * as ecr from 'aws-cdk-lib/aws-ecr';

...

ecr.EnableEnhancedImageScanning( {
scanOnPush: true,
filters: "*",
});
```

### Other Information

_No response_

### Acknowledgements

- [X] I may be able to implement this feature request
- [X] This feature might incur a breaking change

### CDK version used

v2

### Environment details (OS name and version, etc.)

macOS 13.4

Start with the aws_ecr entry point and the referenced CfnRepository.ImageScanningConfigurationProperty interface, then read the linked AWS enhanced image-scanning documentation. Clarify the account-wide CDK API and verify that the requested scan-on-push and filter behavior can be represented; done means enhanced scanning can be enabled through CDK rather than a custom-resource stack.

Written by the indexing model from the issue text.