chore: add library type to .repo-metadata.json (#1345)

Author: parthea

.repo-metadata.json

@@ -1,11 +1,12 @@
-  
+
 {
     "name": "google-api-python-client",
     "name_pretty": "Google API Python Client",
     "client_documentation": "https://github.com/googleapis/google-api-python-client/tree/master/docs#google-api-client-library-for-python-docs",
     "issue_tracker": "https://github.com/googleapis/google-api-python-client/issues",
     "release_level": "ga",
     "language": "python",
+    "library_type": "REST",
     "repo": "googleapis/google-api-python-client",
     "distribution_name": "google-api-python-client"
-  }
+  }