gh-149738: Fix segmentation fault bug in sqllite3

[sepehr-rs]

Fixes #149738.

>>> import sqlite3
>>> db = sqlite3.connect(":memory:")
>>> del db.row_factory
>>> db.execute("test")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    db.execute("test")
    ~~~~~~~~~~^^^^^^^^
sqlite3.OperationalError: near "test": syntax error
>>> 

• Issue: deleting sqlite3 row_factory causes segfault #149738

[picnixz]

We need tests and check what happens on the created connection after deletion (check that there is still a row factory on the newly created cursor)

[sepehr-rs]

Thanks for your comment and review, @picnixz!
I’ve added the tests as requested and would appreciate any feedback.

P.S. The Read the Docs build is failing, but the logs indicate it’s due to an external issue unrelated to my changes.

[vstinner]

I would prefer using connection_getset instead of connection_members for row_factory and text_factory to raise an exception if the developer tries to delete the attribute (set it to NULL). Add get/set on these attributes.

[sepehr-rs]

Hi @vstinner! Thank you for your kind review. Sorry for the delay, GitHub access has been unreliable here recently.
I’ve made the requested changes and would appreciate your feedback when you have a chance.