feat(ec2): support for Cloud Wan Core Network routes (#35008)

### Reason for this change

Routing through Cloud WAN Core Network

### Description of changes

Added Core Network to RouterType enum, updated typeToParameter function, updated tests.

### Describe any new or updated permissions being added

None 

### Description of how you validated changes

Updated and ran the tests. C

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: nburtsev

packages/@aws-cdk/aws-ec2-alpha/lib/route.ts

@@ -879,5 +879,6 @@ function routerTypeToPropName(routerType: RouterType) {
     [RouterType.TRANSIT_GATEWAY]: 'transitGatewayId',
     [RouterType.VPC_PEERING_CONNECTION]: 'vpcPeeringConnectionId',
     [RouterType.VPC_ENDPOINT]: 'vpcEndpointId',
+    [RouterType.CORE_NETWORK]: 'coreNetworkArn',
   })[routerType];
 }

packages/aws-cdk-lib/aws-ec2/lib/vpc.ts

@@ -2426,6 +2426,11 @@ export enum RouterType {
    * VPC Endpoint for gateway load balancers
    */
   VPC_ENDPOINT = 'VpcEndpoint',
+
+  /**
+   * AWS Network Manager Core Network
+   */
+  CORE_NETWORK = 'CoreNetwork',
 }
 
 function routerTypeToPropName(routerType: RouterType) {
@@ -2440,6 +2445,7 @@ function routerTypeToPropName(routerType: RouterType) {
     [RouterType.TRANSIT_GATEWAY]: 'transitGatewayId',
     [RouterType.VPC_PEERING_CONNECTION]: 'vpcPeeringConnectionId',
     [RouterType.VPC_ENDPOINT]: 'vpcEndpointId',
+    [RouterType.CORE_NETWORK]: 'coreNetworkArn',
   })[routerType];
 }
 

packages/aws-cdk-lib/aws-ec2/test/vpc.test.ts

@@ -2623,6 +2623,10 @@ describe('vpc', () => {
         routerType: RouterType.VPC_ENDPOINT,
         routerId: 'vpc-endpoint-id',
       });
+      (vpc.publicSubnets[0] as Subnet).addRoute('CoreNetworkRoute', {
+        routerType: RouterType.CORE_NETWORK,
+        routerId: 'core-network-arn',
+      });
 
       // THEN
       Template.fromStack(stack).hasResourceProperties('AWS::EC2::Route', {
@@ -2637,6 +2641,9 @@ describe('vpc', () => {
       Template.fromStack(stack).hasResourceProperties('AWS::EC2::Route', {
         VpcEndpointId: 'vpc-endpoint-id',
       });
+      Template.fromStack(stack).hasResourceProperties('AWS::EC2::Route', {
+        CoreNetworkArn: 'core-network-arn',
+      });
     });
   });