backend-{plugin,app}-api: add HttpAuthService + initial implementation

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Carl-Erik Bergström <cbergstrom@spotify.com>
Co-authored-by: blam <ben@blam.sh>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/backend-app-api/package.json

@@ -60,6 +60,7 @@
     "@types/cors": "^2.8.6",
     "@types/express": "^4.17.6",
     "compression": "^1.7.4",
+    "cookie": "^0.6.0",
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "express-promise-router": "^4.1.0",