feat(serverless_negs): Add connection for address input (#566)

Co-authored-by: Ayush Jain <124978972+ayushmjain@users.noreply.github.com>

Author: Umm-E-Kulsum

modules/serverless_negs/metadata.yaml

@@ -93,6 +93,12 @@ spec:
       - name: address
         description: Existing IPv4 address to use (the actual IP address value)
         varType: string
+        connections:
+          - source:
+              source: github.com/terraform-google-modules/terraform-google-address
+              version: ~> 4.3
+            spec:
+              outputExpr: addresses[0]
       - name: enable_ipv6
         description: Enable IPv6 address on the CDN load-balancer
         varType: bool