Extracting generic part of GestureTutorialScreen

Extracting GestureTutorialScreen from BackGestureTutorialScreen so it can be reused for other gestures.
Now all resources, colors, animations are provided as TutorialScreenConfig

Bug: 346576895
Test: Just refactoring, no logic change
Flag: com.android.systemui.shared.new_touchpad_gestures_tutorial
Change-Id: I7e56619fb5d723ab2f0bc5870fe228db03a93b5f