Add iOS ToggleTool View Implementation

[maximbircu]

Abstract

The first and easiest tool which is already implemented in the Android library in #3 should be implemented on iOS too.

Requirements

1. Implement dev tools configuration screen which should display a tools list
2. Implement ToggleTool;
3. Integrate all required tools for linting and testing.

Implementation details

The toggle tool logic is already implemented inside the common module, you just need to provide a view implementation for it.
So basically you need to:

• Provide an implementation for ToggleToolView
• Consume the ToggleToolPresenter

Consumer flow

1. Open the iOS sample app and make sure you see a toggle tool on the screen;
2. Update the tool value;
3. Kill the app process;
4. Restart the app and make sure the tool value you selected previously is preserved.