plugins/auth-backend: added basic saml provider

plugins/auth-backend/package.json

@@ -20,6 +20,7 @@
     "@types/passport": "^1.0.3",
     "@types/passport-github2": "^1.2.4",
     "@types/passport-google-oauth20": "^2.0.3",
+    "body-parser": "^1.19.0",
     "compression": "^1.7.4",
     "cookie-parser": "^1.4.5",
     "cors": "^2.8.5",
@@ -31,11 +32,14 @@
     "passport": "^0.4.1",
     "passport-github2": "^0.1.12",
     "passport-google-oauth20": "^2.0.0",
+    "passport-saml": "^1.3.3",
     "winston": "^3.2.1",
     "yn": "^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "^0.1.1-alpha.6",
+    "@types/body-parser": "^1.19.0",
+    "@types/passport-saml": "^1.1.2",
     "jest-fetch-mock": "^3.0.3",
     "tsc-watch": "^4.2.3"
   },