feat: [backstory] new module for backstory

Author: cloud-java-bot

generation_config.yaml

@@ -284,6 +284,21 @@ libraries:
   GAPICs:
   - proto_path: google/cloud/automl/v1
   - proto_path: google/cloud/automl/v1beta1
+- api_shortname: backstory
+  name_pretty: Malachite Common Protos
+  product_documentation: https://cloud.google.com/chronicle/docs/secops/secops-overview
+  api_description: Common Universal Data Model (UDM) and Entity protos used by Chronicle.
+  client_documentation: 
+    https://cloud.google.com/java/docs/reference/google-cloud-backstory/latest/overview
+  release_level: preview
+  distribution_name: com.google.cloud:google-cloud-backstory
+  api_id: backstory.googleapis.com
+  library_type: GAPIC_AUTO
+  group_id: com.google.cloud
+  cloud_api: true
+  GAPICs:
+  - proto_path: backstory
+  requires_billing: true
 - api_shortname: backupdr
   name_pretty: Backup and DR Service API
   product_documentation: https://cloud.google.com/backup-disaster-recovery/docs/concepts/backup-dr