overlays: notch-city: Add 3 mode display cutout handler [2/3]

[@AgentFabulous - POSP]
- Introduces the HideCutout and StatusBarStock overlay used in the
  3 mode display cutout handler. The HideCutout overlay is necessary
  since we can't register a content observer in the display manager code.
  We only have access to resources during boot. Thus, leave this as an
  overlay and let the config and overlay change methods handle this.
  Though we can probably do statusbar stock height toggling in the
  SystemUI code without overlays, I kinda got lazy by the end, just
  live with it god damn it xD

Signed-off-by: Kshitij Gupta <kshitijgm@gmail.com>
Change-Id: I62f63f39bcb410cfbc68e0028b9cef3d748d7eb6
Signed-off-by: Arghya Chanda <arghyac35@gmail.com>

notch-city: Refactor package name

Signed-off-by: ShubhamB <shubhamprince111@gmail.com>
Change-Id: Ieb8b35a3062c9334e82153a1dd26df3853db4f1f
11 files changed