[Improve] refactor app.py

**Requirement**
* Clean up the app.py bu moving argument parsing related code to a separate class
 `arguments.py -> Arguments` in utility
* Move the configuration parsing related code to a sepparate class
 `configuration.py -> Configuration`
  in utility.

**Where to look @**
* app.py

**Code change located**
* app.py
* utlity module