[AppBarLayout] Introduce expand api #1986
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This solves #1922 in more general way.
expand(AppBarLayout.EXPAND_NONE) = setExpanded(false)
expand(AppBarLayout.EXPAND_ALL) = setExpanded(true)
expand(AppBarLayout.EXPAND_ENTERED) : new feature. same result as scroll down and entering
expand(positive value) : new feature. shows the given height from the bottom of appbarlayout