Add support for SqlAlchemy 2.0

  /home/stoty/workspaces/apache-phoenix/phoenix-queryserver-parent/python-phoenixdb/phoenixdb/tests/test_sqlalchemy.py:161: SADeprecationWarning: The dbapi() classmethod on dialect classes has been renamed to import_dbapi().  Implement an import_dbapi() classmethod directly on class <class 'phoenixdb.sqlalchemy_phoenix.PhoenixDialect'> to remove this warning; the old .dbapi() classmethod may be maintained for backwards compatibility.
    return db.create_engine(urlunparse(url_parts), tls=tls, connect_args=connect_args)-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================================================================================== short test summary info ========================================================================================
FAILED phoenixdb/tests/test_sqlalchemy.py::SQLAlchemyTest::test_connection - TypeError: Additional arguments should be named <dialectname>_<argument>, got 'autoload'
FAILED phoenixdb/tests/test_sqlalchemy.py::SQLAlchemyTest::test_reflection - sqlalchemy.exc.ObjectNotExecutableError: Not an executable object: 'drop table if exists us_population'
FAILED phoenixdb/tests/test_sqlalchemy.py::SQLAlchemyTest::test_schema_filtering - sqlalchemy.exc.ObjectNotExecutableError: Not an executable object: 'drop view if exists ALCHEMY_TEST_VIEW'
FAILED phoenixdb/tests/test_sqlalchemy.py::SQLAlchemyTest::test_textual - sqlalchemy.exc.ObjectNotExecutableError: Not an executable object: 'drop table if exists ALCHEMY_TEST'