GREG-21: Add foedselsnummer as type

Adding fødselsnummer as an identification type.

greg/migrations/0001_initial.py

-# Generated by Django 3.2.5 on 2021-08-19 12:47
+# Generated by Django 3.2.5 on 2021-08-20 08:20
 
 import datetime
 import dirtyfields.dirtyfields
@@ -165,7 +165,7 @@ class Migration(migrations.Migration):
                 ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('created', models.DateTimeField(auto_now_add=True)),
                 ('updated', models.DateTimeField(auto_now=True)),
-                ('type', models.CharField(choices=[('ID_PORTEN', 'Id Porten'), ('FEIDE_ID', 'Feide Id'), ('PASSPORT', 'Passport'), ('DRIVERS_LICENSE', 'Drivers License'), ('NATIONAL_ID_CARD', 'National Id Card'), ('OTHER', 'Other')], max_length=16)),
+                ('type', models.CharField(choices=[('ID_PORTEN', 'Id Porten'), ('FEIDE_ID', 'Feide Id'), ('PASSPORT', 'Passport'), ('DRIVERS_LICENSE', 'Drivers License'), ('NATIONAL_ID_CARD', 'National Id Card'), ('NATIONAL_ID_NUMBER', 'National Id Number'), ('OTHER', 'Other')], max_length=18)),
                 ('source', models.CharField(max_length=256)),
                 ('value', models.CharField(max_length=256)),
                 ('verified', models.CharField(blank=True, choices=[('AUTOMATIC', 'Automatic'), ('MANUAL', 'Manual')], max_length=9)),