New serverless pattern - Add REST API Gateway with VPC Link V2 to Private ALB pattern

[agawanea]

Issue https://github.com/aws-samples/serverless-patterns/issues/2869

This pattern demonstrates REST API Gateway integration with a private Application Load Balancer and ECS Fargate cluster using VPC Link V2.

What's included:

• REST API Gateway with proxy integration
• VPC Link V2 for private connectivity to ALB
• Private Application Load Balancer
• ECS Fargate cluster with nginx
• Complete security groups and IAM roles
• Terraform implementation

Tested in: us-east-1

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