vertical resizer for inline block views

[progrium]

Both CodeBlock and InlineFrame should be vertically resizable. I imagine a VerticalResizer component under ui we can wrap both in that has a horizontal bar underneath its children DOM elements that can be clicked and dragged to resize.

Then CodeBlock and InlineFrame need to be modified to take up 100% of vertical height of the resizer element using CSS. While doing this, we should also make sure this means when you zoom/open a CodeBlock or InlineFrame node, it takes up all the vertical space of the panel.