Archive, don’t delete contact lists

So we keep a record of who first uploaded a list it’s better to archive
a list than completely delete it.

The list in the database doesn’t contain any recipient info so this
isn’t a change to what data we’re retaining.

This means updating the endpoints that get contact lists to exclude ones
that are archived.

migrations/versions/0319_contact_list_archived.py

@@ -0,0 +1,26 @@
+"""
+
+Revision ID: 0319_contact_list_archived
+Revises: 0318_service_contact_list
+Create Date: 2020-03-26 11:16:12.389524
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+revision = '0319_contact_list_archived'
+down_revision = '0318_service_contact_list'
+
+
+def upgrade():
+    op.add_column(
+        'service_contact_list',
+        sa.Column('archived', sa.Boolean(), nullable=False, server_default=sa.false()),
+    )
+
+
+def downgrade():
+    op.drop_column(
+        'service_contact_list',
+        'archived',
+    )