chore: add outputs for main module

Author: rohit-ng

outputs.tf

@@ -0,0 +1,19 @@
+output "rds_instance_endpoint" {
+  description = "Endpoint of RDS instance"
+  value       = module.kong_rds.db_instance_endpoint
+}
+
+output "ecs_service_arn" {
+  description = "ARN of kong ECS service"
+  value       = module.ecs_kong.ecs_service_arn
+}
+
+output "public_alb_dns" {
+  description = "DNS name of public ALB"
+  value       = module.ecs_kong.alb_dns_name
+}
+
+output "internal_alb_dns" {
+  description = "DNS name of internal ALB"
+  value       = module.internal_alb_kong.arn
+}