fix build

Author: jinseopkim0

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/admin/v2/stub/AwaitConsistencyCallable.java

@@ -51,15 +51,15 @@
  * <p>This callable wraps GenerateConsistencyToken and CheckConsistency RPCs. It will generate a
  * token then poll until isConsistent is true.
  */
-class AwaitConsistencyCallable extends UnaryCallable<ConsistencyRequest, Void> {
+public class AwaitConsistencyCallable extends UnaryCallable<ConsistencyRequest, Void> {
   private final UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse>
       generateCallable;
   private final UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable;
   private final RetryingExecutor<CheckConsistencyResponse> executor;
 
   @Nullable private final TableAdminRequestContext requestContext;
 
-  static AwaitConsistencyCallable create(
+  public static AwaitConsistencyCallable create(
       UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse>
           generateCallable,
       UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable,
@@ -79,7 +79,7 @@ static AwaitConsistencyCallable create(
         generateCallable, checkCallable, retryingExecutor, requestContext);
   }
 
-  static AwaitConsistencyCallable create(
+  public static AwaitConsistencyCallable create(
       UnaryCallable<GenerateConsistencyTokenRequest, GenerateConsistencyTokenResponse>
           generateCallable,
       UnaryCallable<CheckConsistencyRequest, CheckConsistencyResponse> checkCallable,