code: @EachBean(DataSource.class)
      DataSourceTransactionManager dataSourceTransactionManager(
              DataSource dataSource) {
          DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager(dataSource);
          dataSourceTransactionManager.afterPropertiesSet();
          return dataSourceTransactionManager;
      }
docs: For each {@link DataSource} add a {@link DataSourceTransactionManager} bean.
  
  @param dataSource The data source
  @return The bean to add