JS bindings: Expose HadOverflow property

[ctensmeyer]

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The struct in javascript/src/Layout.h only exposes top, left, right, bottom, width, and height properties, while the C API in yoga/YGNodeLayout.h additionally has YGNodeLayoutGetHadOverflow(). Can a wrapper for YGNodeLayoutGetHadOverflow() get added to the JS bindings?

Note this isn't the Overflow style property (which is already the JS bindings), but the flag set during the layout algorithm to indicate the Node overflows.