Adding Private Space views to Launcher.

This CL adds the following:
* Static View Elements to be added to AllApps recycler View
* View Controller to load the above elements dynamically
* Private Space Section Decorator
* PrivateProfile Manager containing the logic related to Private Space
* Abstract UserProfileManager as the super class of Work/Private
ProfileManager

Private Space Views Figma
[link](https://www.figma.com/file/K6bIIcG882EiJNjxvSWsFT/V%E2%80%A2-Private-Space?type=design&node-id=14535-111985&mode=design&t=JLz9W0O551TpzQYH-0)

Flag: ACONFIG com.android.launcher3.Flags.enable_private_space DEVELOPMENT
Bug: 289223923
Test: Ran Launcher3 tests
Change-Id: I8aa4247c78064a551e5e0d0b46d3fc033873f99d