[WRTjs][VD] Introduce in-process VideoSplashScreen

[WRTjs][VD] Introduce in-process VideoSplashScreen

From Tizen 5.5 VideoSplashScreen has been introduced, which is
running on amd process as amd-extension.

Recently, amd process had some performance issues due to video
playing, so we had decided to move VSS feature to WRT side.

This patch MUST be released with AppFW team's changes, wich disable
VSS feature on their side.

Change-Id: I0d564941628c883d644d1a89e0a46a0d06eb45e2
Signed-off-by: DongHyun Song <dh81.song@samsung.com>