Add Cloud Monitoring API Enablement for pubsub install setup

Author: ravinadhruve10

modules/integrations/pub-sub/README.md

@@ -5,6 +5,8 @@ Before applying the changes defined in this module, the following operations nee
 
 - The APIs needed for the CDR/CIEM feature are listed below:
     - Cloud Pub/Sub API
+    - Cloud Logging API
+    - Cloud Monitoring API
 
 - The following resources will be created in each instrumented project:
     - A `PubSub Topic` to send the AuditLogs from the project

test/examples/project_api_enablement/cdr_ciem/main.tf

@@ -4,6 +4,7 @@ It will create a google_project_service resource per each service enabled within
 The APIs needed for the CDR/CIEM feature are listed below:
   - Cloud Pub/Sub API
   - Cloud Logging API
+  - Cloud Monitoring API
 
 * Note: This do not overwrite any other APIs config that your GCP project has, it will only enabled it if isn't yet.
 */
@@ -13,7 +14,8 @@ locals {
   project = "<MANAGEMENT_PROJECT_ID>"
   services = [
     "pubsub.googleapis.com",
-    "logging.googleapis.com"
+    "logging.googleapis.com",
+    "monitoring.googleapis.com"
   ]
 }