Provide new APIs for customize splash screen window.(3/N)

Create new APIs for developer to customize starting window
- windowSplashScreenBackground: specify the background color
- windowSplashScreenAnimatedIcon: replace center icon on starting
window, and it can be animatable.
- windowSplashScreenAnimationDuration: the animation duration if
the replace icon is animatable, it cannot exceed
max_starting_window_intro_icon_anim_duration.

Support ADV to replace the icon on starting window.

Ref doc: go/improved_app_launch_animations

Bug: 73289295
Test: build/flash
Test: check splash screen starting window.
Test: atest StartingSurfaceDrawerTests SplashscreenTests
Test: atest ShellTaskOrganizerTests
Change-Id: Id3de3e9b57d769f096baf43713c1e3c327ecfdc8