Merge "Added an option to permanently close sessions." into main

diff --cc lib/sqlalchemy/ext/asyncio/scoping.py
Simple merge

diff --cc lib/sqlalchemy/ext/asyncio/session.py
Simple merge

diff --cc lib/sqlalchemy/orm/scoping.py
Simple merge

diff --cc lib/sqlalchemy/orm/session.py
Simple merge

diff --cc test/ext/asyncio/test_session_py3k.py
Simple merge

diff --cc test/orm/test_session.py
Simple merge