Add sample method

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Add sample method

https://github.com/apache/incubator-wayang/blob/d44a00a45f2e3ab9b2abd08a1b4c1aa94750a3f1/wayang-api/wayang-api-json/src/main/scala/operatorfromjson/unary/SampleOperatorFromJson.scala#L35

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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package org.apache.wayang.api.json.operatorfromjson.unary

import com.fasterxml.jackson.annotation.JsonTypeName
import org.apache.wayang.api.json.operatorfromjson.OperatorFromJson

@JsonTypeName(OperatorFromJson.OperatorNames.Sample)
case class SampleOperatorFromJson(override val id: Long,
                                  override val input: Array[Long],
                                  override val output: Array[Long],
                                  override val cat: String,
                                  override val operatorName: String,
                                  val data: SampleOperatorFromJson.Data)
  extends OperatorFromJson(id, input, output, cat, operatorName) {
}

object SampleOperatorFromJson {
  // TODO: Add sample method
  case class Data(sampleSize: Int)
}

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