Enhancement/22 reset config

[HarshaVardhanNakkina]

• moved all platform configurations to separate commands, as sub-commands under config
  • like config dev, config medium ...
• created a new command reset under config for resetting config values for platforms
  • like config reset dev, config reset cloudinary ...
• every platform has its own subcommand under reset like config reset dev, config reset medium
• config reset all or just config reset will reset all non-platform configurations
• config store has been moved to separate file src/config-store.js, with schema and defaults defined for every platform and config keys

[shahednasser]

Awesome thank you for the great work!