[HMR] Apply changes in application styles at runtime #6645

Overview

{N} 5.0 includes Beta version of the Hot Module Replacement (HMR) feature provided by webpack which makes possible to replace modules in a bundled application while the application is running.

A possible improvement after the Beta release is applying changes in styles instantly.
The first step on this journey is to apply changes in application styles app.(css|scss) at runtime.

Current State

A change in application styles app.(css|scss) triggers a navigation to the same page where the change is applied.

Future State

A change in application styles app.(css|scss) applies on the current page, avoiding its reloading/navigating to the same page and preserving the state of the page and navigation history.

Related to #6398.