Copy json files to dist folder on build:local (#862)

Author: alexslavr

packages/devextreme-react-generator/tsconfig.local.json

@@ -21,7 +21,8 @@
    },
    "include": [
      "src/**/*.ts",
-     "src/**/*.tsx"
+     "src/**/*.tsx",
+     "src/**/*.json"
    ],
    "exclude": [
      "src/**/*.test.ts",