Refactor stonedb #162

Job	Run time
DBMS Tests (Citus)	6m 29s
DBMS Tests (ClickHouse)	15m 47s
QPG Tests (CockroachDB)	6m 16s
DBMS Tests (CockroachDB)	7m 0s
DBMS Tests (Databend)	15m 54s
DBMS Tests (Apache Doris)	35s
DBMS Tests (DuckDB)	5m 59s
DBMS Tests (H2)	6m 2s
Java 13 Compatibility (DuckDB)	1m 16s
Java 14 Compatibility (DuckDB)	1m 10s
Java 15 EA Compatibility (DuckDB)	2m 7s
DBMS Tests (MariaDB)	1m 17s
DBMS Tests (Materialize)	12m 1s
QPG Tests (Materialize)	6m 29s
General tests	3m 6s
DBMS Tests (MySQL)	11m 0s
DBMS Tests (PostgreSQL)	11m 9s
Reducer Tests	48s
DBMS Tests (SQLite)	10m 51s
QPG Tests (SQLite)	6m 1s
DBMS Tests (StoneDB)	3m 19s
DBMS Tests (TiDB)	6m 25s
QPG Tests (TiDB)	6m 20s
DBMS Tests (YugabyteDB)	11m 29s
	2h 38m 50s

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