feat: add use_topic_schema for Cloud Storage Subscriptions

PiperOrigin-RevId: 643385701

Author: Google APIs

google/pubsub/v1/pubsub.proto

@@ -1168,6 +1168,10 @@ message CloudStorageConfig {
     // data (for example, an ordering_key, if present) are added as entries in
     // the attributes map.
     bool write_metadata = 1 [(google.api.field_behavior) = OPTIONAL];
+
+    // Optional. When true, the output Cloud Storage file will be serialized
+    // using the topic schema, if it exists.
+    bool use_topic_schema = 2 [(google.api.field_behavior) = OPTIONAL];
   }
 
   // Possible states for a Cloud Storage subscription.
@@ -1188,6 +1192,10 @@ message CloudStorageConfig {
     // Cannot write to the destination because enforce_in_transit is set to true
     // and the destination locations are not in the allowed regions.
     IN_TRANSIT_LOCATION_RESTRICTION = 4;
+
+    // Cannot write to the Cloud Storage bucket due to an incompatibility
+    // between the topic schema and subscription settings.
+    SCHEMA_MISMATCH = 5;
   }
 
   // Required. User-provided name for the Cloud Storage bucket.