FEAT-#6913: support sqlalchemy connectables in read_sql by getting connection url

[tochigiv]

What do these changes do?

As outlined in the issue, these changes allow passing SQLAlchemy connection objects to read_sql by using the same workaround that is used for to_sql.

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• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves FEAT: Support sqlalchemy connections in read_sql by converting them to strings #6913
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[anmyachev]

@tochigiv thanks for the contribution! Could you also add a test?

[tochigiv]

@tochigiv thanks for the contribution! Could you also add a test?

Is it not already covered by a test?

modin/modin/pandas/test/test_io.py

Lines 2508 to 2524 in a96a9a9

	# Test SQLAlchemy engine
	sqlalchemy_engine = sa.create_engine(conn)
	eval_io(
	fn_name="read_sql",
	# read_sql kwargs
	sql=query,
	con=sqlalchemy_engine,
	)
	# Test SQLAlchemy Connection
	sqlalchemy_connection = sqlalchemy_engine.connect()
	eval_io(
	fn_name="read_sql",
	# read_sql kwargs
	sql=query,
	con=sqlalchemy_connection,
	)

[anmyachev]

@tochigiv thanks for the contribution! Could you also add a test?

Is it not already covered by a test?

modin/modin/pandas/test/test_io.py

Lines 2508 to 2524 in a96a9a9

	# Test SQLAlchemy engine
	sqlalchemy_engine = sa.create_engine(conn)
	eval_io(
	fn_name="read_sql",
	# read_sql kwargs
	sql=query,
	con=sqlalchemy_engine,
	)
	# Test SQLAlchemy Connection
	sqlalchemy_connection = sqlalchemy_engine.connect()
	eval_io(
	fn_name="read_sql",
	# read_sql kwargs
	sql=query,
	con=sqlalchemy_connection,
	)

Hm, looks like that.