Add layout to size illustrations

- Add FillContentLayout, which is a (frame)layout which, when set
  to fill the remaining space of its parent, will make sure its
  children are sized between minWidth/minHeight and
  maxWidth/maxHeight.
- Renamed styleable SuwIntrinsicSizeFrameLayout to be consistent with
  the name of the view that uses it.

Test: ./gradlew connectedAndroidTest test
Bug: 38210310
Change-Id: I5b2aa6cfe8b4a05843de25d39cae776609f3d161