✨(backend) add full_name short_name on User model

Following @sampaccoud's work on impress, add new fields to handle
user names in our application.

@sampaccoud preferred having a full and short names instead of
a basic first and last ones, to follow common good practices, and
avoid having frontend formating names (from my understanding).

Please see commit eee20033 on Impress.

src/backend/core/migrations/0008_user_full_name_user_short_name.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.1.1 on 2024-11-13 09:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0007_recording_mode'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='full_name',
+            field=models.CharField(blank=True, max_length=100, null=True, verbose_name='full name'),
+        ),
+        migrations.AddField(
+            model_name='user',
+            name='short_name',
+            field=models.CharField(blank=True, max_length=100, null=True, verbose_name='short name'),
+        )
+    ]