test: include sqlalchemy 1.4 test in python client testing

[neverchanje]

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What's changed and what's your intention?

We used to lack a test for sqlalchemy. The demo will be used for document. https://github.com/risingwavelabs/risingwave-docs/issues/1745

https://buildkite.com/risingwavelabs/integration-tests/builds/566 passed.

It should be noted that:

1. When creating tables using sqlalchemy, it will somehow translate a BIGINT primary key into BIGSERIAL, which is not supported in RisingWave. As a workaround, I manually wrote the CREATE TABLE query in the test.

class User(Base):
    __tablename__ = 'users'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    age = Column(Integer)

Base = declarative_base()
Base.metadata.create_all(engine)
# the automatic table creation will fail due to the incorrect translation from integer to serial.

2. sqlalchemy was released 2.0 at the early 2023 and our driver may have some incompatibility issues with it. I did not test the 2.0 version since there is barely no tutorial available. Therefore, we should recommend users to try 1.4x versions for stability. The latest as of writing is 1.4.51

Checklist

• I have added necessary unit tests and integration tests

[yuhao-su]

Something related to the bigserial issue https://stackoverflow.com/questions/48211732/how-to-add-bigserial-primary-key-to-sqlalchemy