refactor(nodes): Remove position func

* it's not improving on existing methods, i.e. no real benefit to it

package/src/store/actions.ts

@@ -103,12 +103,7 @@ const createGraphNodes = (nodes: Node[], getNode: Getters['getNode'], currGraphN
     if (node.parentNode && !nextNodes.find((n) => n.id === node.parentNode)) {
       console.warn(`[vueflow]: Parent node ${node.parentNode} not found`)
     }
-    const position =
-      (<any>node).position instanceof Function
-        ? (<any>node).position(node, currGraphNodes, node.parentNode ? getNode(node.parentNode) : undefined)
-        : node.position
 
-    if (position) node.position = position
     if (node.parentNode || parentNodes[node.id]) {
       if (parentNodes[node.id]) {
         node.isParent = true

package/src/types/node.ts

@@ -10,17 +10,12 @@ export type NodeHandleBounds = {
   target?: HandleElement[]
 }
 
-type PositionFunc = <Data = ElementData>(
-  node: GraphNode<Data>,
-  currNodes: GraphNode<Data>[],
-  parentNode: GraphNode<Data>,
-) => XYPosition
 type WidthFunc = <Data = ElementData>(node: GraphNode<Data>) => number | string | void
 type HeightFunc = <Data = ElementData>(node: GraphNode<Data>) => number | string | void
 
 export interface Node<Data = ElementData> extends Element<Data> {
   /** initial node position x, y */
-  position: XYPosition | PositionFunc
+  position: XYPosition
   /** node type, can be a default type or a custom type */
   type?: keyof DefaultNodeTypes | string
   /** handle position */
@@ -60,8 +55,6 @@ export interface Node<Data = ElementData> extends Element<Data> {
 }
 
 export interface GraphNode<Data = ElementData> extends Node<Data> {
-  /** current node position x, y */
-  position: XYPosition
   /** absolute position in relation to parent elements + z-index */
   computedPosition: XYZPosition
   handleBounds: NodeHandleBounds