chore: add dev dependencies for cloud-rad ref docs (#192)

Author: fhinkel

packages/google-cloud-datacatalog/package.json

@@ -41,7 +41,9 @@
     "mocha": "^8.0.0",
     "pack-n-play": "^1.0.0-2",
     "sinon": "^9.0.1",
-    "typescript": "^3.8.3"
+    "typescript": "^3.8.3",
+    "@microsoft/api-documenter": "^7.8.10",
+    "@microsoft/api-extractor": "^7.8.10"
   },
   "scripts": {
     "docs": "jsdoc -c .jsdoc.js",
@@ -57,7 +59,9 @@
     "pretest": "npm run compile",
     "prelint": "cd samples; npm link ../; npm install",
     "clean": "gts clean",
-    "precompile": "gts clean"
+    "precompile": "gts clean",
+    "api-extractor": "api-extractor run --local",
+    "api-documenter": "api-documenter yaml --input-folder=temp"
   },
   "license": "Apache-2.0",
   "engines": {