(aws-cdk-lib.Fn): Support Fn::ForEach

### Describe the feature

Fn::ForEach is a new function that is added to cloudformation.

### Use Case

Creating multiple resources based on Cloudformation template parameter. I'm deploying CDK generated templates to Service Cataloge.

### Proposed Solution

ForEach function in aws-cdk-lib.Fn

### Other Information

_No response_

### Acknowledgements

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

### CDK version used

v2.96.2

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

Any

Start at the aws-cdk-lib.Fn entry point and review how existing CloudFormation functions are exposed. Confirm the implementation supports Fn::ForEach in CDK-generated templates and can be used for Service Catalog deployments; add or update coverage where the project tests Fn helpers.

Written by the indexing model from the issue text.