frontend-plugin-api: add support for extension configuration schema

Co-authored-by: Camila Belo <camilaibs@gmail.com>
Co-authored-by: Philipp Hugenroth <philipph@spotify.com>
Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Vincenzo Scamporlino <vincenzos@spotify.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/frontend-plugin-api/package.json

@@ -33,6 +33,9 @@
     "react": "^16.13.1 || ^17.0.0"
   },
   "dependencies": {
-    "lodash": "^4.17.21"
+    "@backstage/types": "workspace:^",
+    "lodash": "^4.17.21",
+    "zod": "^3.21.4",
+    "zod-to-json-schema": "^3.21.4"
   }
 }