Add two more Api for SplashScreenView(7/N)

getIconAnimationDuration - Returns the duration of the icon animation
if icon is animatable.
getIconAnimationStart - If the replaced icon is animatable, return
the animation start time in millisecond based on system.

Bug: 73289295
Test: atest CtsWindowManagerDeviceTestCases:SplashscreenTests
Change-Id: Ie4332d6764b4d0892a0e5e6f7c297102b71a79f9