Mocked SideMenus support

[d4vidi]

Describe your idea

Motivation

The mocking library currently lacks explicit handling of side menus, preventing mocked tests over elements containing them from being properly written.

Implementation

• Write the necessary logical layout tree representation nodes (SideMenuRoot, etc.). Note: Currently side-menus in a screen structure fall into the BottomTabs default.
  Note2: This is required even though the layout tree parser does contain support for side menus creation.
• Create the actual (lean) mock (stub?) UI component, alongside the existing ones, so as to support UI creation for when the SideMenuRoot etc. types do come in, after finishing up with the previous point.
• Remove the side-menu tests E2E-only restriction

Steps

Hopefully TDD while gradually uncommenting the side-menus E2E 😄

Release

Both on top of the latest v8 and v7's.