fix(fullscreen magnification): Add orange Border from SysUI

Create FullscreenMagnificationController for handling fullscreen magnification stuffs in SystemUI:
1. The border is set to a thicker width to guarantee that there is no free space between the orange border and the device edges
2. The border is always fullscreen and will be added/removed on fullscreen magnification activation change

Bug: 291891390
Test: adb shell device_config put accessibility com.android.window.flags.always_draw_magnification_fullscreen_border true
      atest SystemUITests:FullscreenMagnificationControllerTest
      atest IMagnificationConnectionTest
Flag: ACONFIG always_draw_magnification_fullscreen_border DEVELOPMENT
Change-Id: Ib380cf0679f2f980c3504af27cca15047fd55ac5