Enabling Private Space Container in Launcher.

This CL adds the following:
1. Adds filtering and addition of Private Profile apps in main user
all apps recycler view
2. Enables decoration of Private Profile apps
3. Enables hiding Private Space container based upon a settings entry.

Flag: ACONFIG com.android.launcher3.Flags.enable_private_space DEVELOPMENT
Bug: 289223923
Test: Ran Launcher3 tests
Change-Id: I33dc55a3a39e75d3fc336ca6a488b282e2dd322c