Split nestedScrollToScene into horizontal and vertical variants

To have clearer APIs, we have converted

nestedScrollToScene(orientation, startBehavior, endBehavior)

into two methods:

horizontalNestedScrollToScene(leftBehavior, rightBehavior)
verticalNestedScrollToScene(topBehavior, bottomBehavior)

This CL is just a refactor

Test: no tests
Bug: 311625497
Flag: NA
Change-Id: I04e291275d2c7ae9266c8ed9e9acd3cdbb69ce2d