Refactor stonedb #169

Job	Run time
QPG Tests (CockroachDB)	6m 9s
DBMS Tests (Citus)	6m 18s
DBMS Tests (ClickHouse)	15m 46s
DBMS Tests (CockroachDB)	5m 59s
DBMS Tests (Databend)	11m 29s
DBMS Tests (Apache Doris)	25s
DBMS Tests (DuckDB)	5m 49s
DBMS Tests (H2)	5m 54s
Java 13 Compatibility (DuckDB)	1m 6s
Java 14 Compatibility (DuckDB)	1m 12s
Java 15 EA Compatibility (DuckDB)	1m 1s
DBMS Tests (MariaDB)	1m 42s
DBMS Tests (Materialize)	11m 58s
QPG Tests (Materialize)	6m 51s
General tests	2m 0s
DBMS Tests (MySQL)	11m 5s
DBMS Tests (PostgreSQL)	10m 56s
Reducer Tests	56s
DBMS Tests (SQLite)	11m 5s
QPG Tests (SQLite)	5m 50s
DBMS Tests (StoneDB)	3m 20s
DBMS Tests (TiDB)	6m 13s
QPG Tests (TiDB)	5m 56s
DBMS Tests (YugabyteDB)	11m 29s
	2h 30m 29s

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