Flink大数据实时计算系列-案例初体验：AppMarketingByChannel
生成模拟数据MarketingUserBehavior{
userId=3706363402265820302, behavior='INSTALL', channel='weibo', timestamp=1616042603882}
MarketingUserBehavior{
userId=225582473088922103, behavior='DOWNLOAD', channel='app store', timestamp=1616042604004
