impl(bq_driver): Picosecond support

Author: Khushikathuria008

build/_deps/google-cloud-cpp-build/external/googleapis/src/googleapis_download/google/cloud/bigquery/v2/data_format_options.proto

@@ -0,0 +1,51 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.cloud.bigquery.v2;
+
+import "google/api/field_behavior.proto";
+
+option go_package = "cloud.google.com/go/bigquery/v2/apiv2/bigquerypb;bigquerypb";
+option java_outer_classname = "DataFormatOptionsProto";
+option java_package = "com.google.cloud.bigquery.v2";
+
+// Options for data format adjustments.
+message DataFormatOptions {
+  // The API output format for a timestamp.
+  enum TimestampOutputFormat {
+    // Corresponds to default API output behavior, which is FLOAT64.
+    TIMESTAMP_OUTPUT_FORMAT_UNSPECIFIED = 0;
+
+    // Timestamp is output as float64 seconds since Unix epoch.
+    FLOAT64 = 1;
+
+    // Timestamp is output as int64 microseconds since Unix epoch.
+    INT64 = 2;
+
+    // Timestamp is output as ISO 8601 String
+    // ("YYYY-MM-DDTHH:MM:SS.FFFFFFFFFFFFZ").
+    ISO8601_STRING = 3;
+  }
+
+  // Optional. Output timestamp as usec int64. Default is false.
+   std::string timestamp_output_format;
+
+  // Optional. The API output format for a timestamp.
+  // This offers more explicit control over the timestamp output format
+  // as compared to the existing `use_int64_timestamp` option.
+  TimestampOutputFormat timestamp_output_format = 3
+      [(google.api.field_behavior) = OPTIONAL];
+}