Add feature StorageGroup fast activation

In order to improve the efficiency of concurrency write in cluster StorageGroup, we should create some DataRegionGroup after the specified StorageGroup was activated. i.e. Create a DataRegionGroup for each newborn SeriesPartitionSlot for the newly created StorageGroup. The number of this operation is equal to the parameter `least_data_region_group_num` in iotdb-common.properties file.