🐛 Change get_user_by_email to be case insensetive

[grabov]

Fix an issue where get_user_by_email won't return a user object if the requested email case doesn't match the string in the database.

[tiangolo]

Thanks, in this case I think it would be better to lowercase it before passing it to SQLAlchemy/SQLModel, and ensure it is lowercase before saving it to the databse.

Now, in the case of emails, IIRC, domains are case insensitive, but email usernames are not even if many providers consider them case insensitive, it's not part of a standard. So, I would consider this a special use case for a specific app, not something that would apply in general.

Given that, I'll pass on this one, but thanks for the interest! ☕