Add notifications API endpoint

src/tests/test_api_notifications.py

@@ -0,0 +1,18 @@
+from test_api import client
+from types import SimpleNamespace
+import queue
+import seedpass.api as api
+
+
+def test_notifications_endpoint(client):
+    cl, token = client
+    api._pm.notifications = queue.Queue()
+    api._pm.notifications.put(SimpleNamespace(message="m1", level="INFO"))
+    api._pm.notifications.put(SimpleNamespace(message="m2", level="WARNING"))
+    res = cl.get("/api/v1/notifications", headers={"Authorization": f"Bearer {token}"})
+    assert res.status_code == 200
+    assert res.json() == [
+        {"level": "INFO", "message": "m1"},
+        {"level": "WARNING", "message": "m2"},
+    ]
+    assert api._pm.notifications.empty()