feat: add use_table_schema field to BigQueryConfig (#1858)

* feat: add `use_table_schema` field to BigQueryConfig

PiperOrigin-RevId: 587079085

Source-Link: googleapis/googleapis@95fabe6

Source-Link: googleapis/googleapis-gen@90b35e9
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protos/google/pubsub/v1/pubsub.proto

@@ -997,9 +997,10 @@ message BigQueryConfig {
   // {projectId}.{datasetId}.{tableId}
   string table = 1;
 
-  // When true, use the topic's schema as the columns to write to in BigQuery,
-  // if it exists.
-  bool use_topic_schema = 2;
+  // Optional. When true, use the topic's schema as the columns to write to in
+  // BigQuery, if it exists. `use_topic_schema` and `use_table_schema` cannot be
+  // enabled at the same time.
+  bool use_topic_schema = 2 [(google.api.field_behavior) = OPTIONAL];
 
   // When true, write the subscription name, message_id, publish_time,
   // attributes, and ordering_key to additional columns in the table. The
@@ -1018,6 +1019,11 @@ message BigQueryConfig {
   // Output only. An output-only field that indicates whether or not the
   // subscription can receive messages.
   State state = 5 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Optional. When true, use the BigQuery table's schema as the columns to
+  // write to in BigQuery. `use_table_schema` and `use_topic_schema` cannot be
+  // enabled at the same time.
+  bool use_table_schema = 6 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Configuration for a Cloud Storage subscription.