fix: Creating cache for scoped packages

[TMisiukiewicz]

Summary:

If package.json had scoped package name, e.g. @react-native/tester, it was unable to create CLI cache since fs.writeFileSync could not create it in a path that does not exist. With this PR it will recursively create necessary folder for scoped packages before trying to save the cache file.

Test Plan:

1. Follow the contributing guide
2. run node ./path/to/cli init AppName
3. Run yarn ios and make sure app runs correctly
4. Change name in package.json to @react-native/tester
5. Run yarn ios and make sure app runs correctly
6. Open ~/Library/Caches/react-native-cli/@react-native folder and make sure tester file exists

Checklist

• Documentation is up to date to reflect these changes.
• Follows commit message convention described in CONTRIBUTING.md