chore: Add read test cases for picosecond

Author: lqiu96

google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1/it/ITBigQueryStorageWriteClientTest.java

@@ -59,6 +59,7 @@
 import java.io.IOException;
 import java.math.BigDecimal;
 import java.nio.channels.Channels;
+import java.nio.charset.StandardCharsets;
 import java.sql.Timestamp;
 import java.text.ParseException;
 import java.time.Duration;
@@ -2365,8 +2366,7 @@ public void timestamp_arrowWrite() throws IOException {
   }
 
   @Test
-  public void timestamp_protobufWrite()
-      throws IOException, DescriptorValidationException, InterruptedException {
+  public void timestamp_protobufWrite() throws IOException, DescriptorValidationException, InterruptedException {
     String timestampFieldName = "timestamp";
     String timestampHigherPrecisionFieldName = "timestampHigherPrecision";
     com.google.cloud.bigquery.Schema bqTableSchema =