Implement GroupTool

[maximbircu]

Abstract

There could be cases when several configuration values belong to a common context and it would be nice to have them grouped together somehow. This could be done by implementing a group dev tool, which will allow the library user to place a group of configuration values inside an object and visualize them a separate group inside the configuration screen.

Requirements

Implement a GroupTool, which will help the library consumer group its configuration values which belong to the same context.

Consumer flow

1. Open the sample app and go to the YML dev tools screen.
2. Find a GroupTool UI control
3. Try to update the configuration value of the dev tools inside the group and make sure all of them are persisted after the app restarts.

Repeat the same use-case for Memory dev tools screen.