✨(backend) add full_name and short_name to user model and API

[sampaccoud]

Purpose

We need to add a name for our users instead of showing their email addresses.

Proposal

Add a short_name and full_name fields as per the best international practice.

The full_name and short_name field are synchronized with the OIDC token upon each login. The fields from the token that are synchronized with the the short_name and full_name fields are configurable (in our case firstname + lastname goes to full_name, while first_name goes to short_name)

[AntoLC]

Top!

Can we add the names here as well, with names can be sometime empty?

impress/src/backend/demo/management/commands/create_demo.py

Lines 115 to 125 in e642506

	queue.push(
	models.User(
	admin_email=f"user{i:d}@example.com",
	email=f"user{i:d}@example.com",
	password="!",
	is_superuser=False,
	is_active=True,
	is_staff=False,
	language=random.choice(settings.LANGUAGES)[0],
	)
	)