backend-{plugin,app}-api: added addAuthPolicy to HttpRouterService + 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

@@ -73,6 +73,7 @@
     "minimist": "^1.2.5",
     "morgan": "^1.10.0",
     "node-forge": "^1.3.1",
+    "path-to-regexp": "^6.2.1",
     "selfsigned": "^2.0.0",
     "stoppable": "^1.1.0",
     "winston": "^3.2.1",