Add entitlements and build configuration for MacOS catalina

package.json

@@ -20,6 +20,7 @@
     "build": "electron-builder --config.extraMetadata.environment=$SIGNAL_ENV",
     "build-release": "SIGNAL_ENV=production npm run build -- --config.directories.output=release",
     "sign-release": "node ts/updater/generateSignature.js",
+    "notarize": "node ts/build/notarize.js",
     "build-module-protobuf": "pbjs --target static-module --wrap commonjs --out ts/protobuf/compiled.js protos/*.proto && pbts --out ts/protobuf/compiled.d.ts ts/protobuf/compiled.js",
     "clean-module-protobuf": "rm -f ts/protobuf/compiled.d.ts ts/protobuf/compiled.js",
     "build-protobuf": "yarn build-module-protobuf",
@@ -59,6 +60,7 @@
     "electron-editor-context-menu": "1.1.1",
     "electron-is-dev": "0.3.0",
     "electron-mocha": "8.1.1",
+    "electron-notarize": "0.1.1",
     "emoji-datasource": "4.1.0",
     "emoji-datasource-apple": "4.1.0",
     "emoji-regex": "8.0.0",
@@ -194,6 +196,8 @@
       "artifactName": "${name}-mac-${version}.${ext}",
       "category": "public.app-category.social-networking",
       "darkModeSupport": true,
+      "hardenedRuntime": true,
+      "entitlements": "./build/entitlements.mac.plist",
       "icon": "build/icons/mac/icon.icns",
       "publish": [
         {