Co-Authored-By: Hasan Ramezani <hasan.r67@gmail.com>

Thanks Mariusz for suggesting it.

Thanks Tim Graham for the review.

Fixed #29966 -- Added tests for BaseHandler's "The view didn't return an HttpResponse object" error.

Unused since d334f46b.

Removed DatabaseIntrospection.table_name_converter()/column_name_converter()
and use instead DatabaseIntrospection.identifier_converter().

Removed DatabaseFeatures.uppercases_column_names.

Thanks Tim Graham for the initial patch and review and Simon Charette
for the review.

The class name is the same as one given to the fields in the change list.

Follow up to 9cac10ee.

Co-authored-by: David Sanders <dsanders11@ucsbalum.com>

Obsolete since 742ea514.

Inaccurate since 7d1b69db.

Unused since 7d1b69db.

Co-Authored-By: Sergey Fedoseev <fedoseev.sergey@gmail.com>

The aliases aren't cached and thus the old usage will be an error after
refs #29478.

Unused since b52c7300.

Thanks Eugene Pakhomov for the suggested fix.

Since CPython implements a C level attrgetter(*attrs) it even outperforms the
most common case of a single known related object since the resulting attribute
values tuple is built in C.