Add multiget to usersettings to batch get()s in one call and cache the result for a short period

Signed-off-by: Gustaf Räntilä <g.rantila@gmail.com>

plugins/user-settings/package.json

@@ -69,6 +69,7 @@
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "@material-ui/lab": "4.0.0-alpha.61",
+    "dataloader": "^2.0.0",
     "react-use": "^17.2.4",
     "zen-observable": "^0.10.0"
   },
@@ -82,6 +83,7 @@
     "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^14.0.0",
     "@types/react": "^18.0.0",
+    "already": "^2.2.1",
     "msw": "^1.0.0",
     "react": "^18.0.2",
     "react-dom": "^18.0.2",