Enabled the floating search bar feature

Added the CoordinatorLayout as the top level layout
Added the AppBarLayout to enclose the search bar
Added the app:layout_behavior="@string/appbar_scrolling_view_behavior" to NestedScrollView

Bug: 118886724
Test: manual test
Change-Id: I4a8ef14637dc1dc7cf9618eca00e4b7d7a77c725