Add default automatic imports to shell

[Salvo Polizzi]

It could be useful for the final shell's user to have some default imports to avoid extra work of customizing to the user. Following this discussion ​https://forum.djangoproject.com/t/default-automatic-imports-in-the-shell/33708 , it appears that the most used objects are:

• Utilities for date and timezone, namely datetime and django.utils.timezone modules
• Utilites for making or debugging database queries, namely django.db.models and django.db.models.functionsmodules
• Settings of your projects, namely django.conf.settings

[Natalia Bidart]

Accepting following positive forum discussion. Thank you Salvo for raising this ticket, and working on it!

[Sarah Boyce <42296566+sarahboyce@…>]

In a5cd84a:

Fixed #35680 -- Added automatic imports of common utilies to shell management command.

[GitHub <noreply@…>]

In e767bd6:

Refs #35680 -- Sorted shell default autoimports to prevent isort mismatches.