Incorrect type for onMouseOverNode & onMosueOutNode callback

[JadeJDoucet]

Describe the bug
The type expected for the callback passed to onMouseOverNode is
onMouseOverNode: (nodeId: string) => void;
but should be updated to
onMouseOverNode: (nodeId: string, node: GraphNode) => void;

**From Documentation: **

const onMouseOverNode = function(nodeId, node) {
     window.alert(`Mouse over node ${nodeId} in position (${node.x}, ${node.y})`);
};