[TD-4840]<test>add testcase of compacting sdb

tests/pytest/tsdb/insertDataDb2.json

@@ -38,7 +38,7 @@
             "childtable_count": 200000,
             "childtable_prefix": "stb0_",
             "auto_create_table": "no",
-            "batch_create_tbl_num": 1000,
+            "batch_create_tbl_num": 100,
             "data_source": "rand",
             "insert_mode": "taosc",
             "insert_rows": 2000,