code: Page<Bucket> listBuckets(Storage.BucketListOption... options) {
      initStorage();
      return storage.list(options);
    }
docs: Lists the project's buckets. But use the one in CloudStorageFileSystem.
  
  <p>Example of listing buckets, specifying the page size and a name prefix.
  
  <pre>{@code
  String prefix = "bucket_";
  Page<Bucket> buckets = provider.listBuckets(BucketListOption.prefix(prefix));
  Iterator<Bucket> bucketIterator = buckets.iterateAll();
  while (bucketIterator.hasNext()) {
  Bucket bucket = bucketIterator.next();
  // do something with the bucket
  }
  }</pre>
  
  @throws StorageException upon failure