[AWS Firewall Manager] - [Enhancement] - Resources of AWS Firewall Manager services scanned by IaC Generator

### Name of the resource

AWS::FMS::NotificationChannel

### Resource name

_No response_

### Description

Currently IaC Generator does not support scanning the resources of AWS Firewall Manager services, requesting a feature request so that resource type of Firewall manager services **AWS::FMS::NotificationChannel**, **AWS::FMS::Policy**, **AWS::FMS::ResourceSet** can be scanned with IaC Generator.

### Other Details

_No response_

No files, tests, or entry points are identified in the issue. Start by locating IaC Generator's resource-scanning support and determine how AWS::FMS::NotificationChannel, AWS::FMS::Policy, and AWS::FMS::ResourceSet are represented; done means all three can be scanned.

Written by the indexing model from the issue text.