feat: implementation of support for multiple configs

[Yash-Garg]

Add support for multiple configs addition/modification and switching between them.

• [x] Global screen for listing all the ServerConfig with an edit button.
• [ ] Load old config data by passing a Bundle through NavArgs and show it inside ConfigFragment fields.
• [x] Redirect home fragment FAB to navigate on ServerManagerFragment.
• [ ] Reload ClientManager whenever a config is modified or switched.
• [ ] Persist currently selected config inside DataStore or SharedPreferences.
• [ ] Show a three-dot menu on right edge of config to show options, DELETE and MODIFY.