feat(utils): add vanilla drag and panzoom (#3108)

* refactor(panzoom): create vanilla helper

* feat(svelte): add interaction example

* refactor(panzoom): cleanup

* Update function-runner.ts

* refactor(panzoom): cleanup

* refactor(panzoom): rename functions

* feat(utils): add vanilla drag helper (#3107)

* feat(utils): add vanilla drag helper

* refactor(drag): cleanup

* refactor(drag): cleanup

* chore(packages): cleanup

* refactor(panzoom): cleanup and simplify

packages/svelte/src/lib/container/Pane/Pane.svelte

@@ -48,7 +48,7 @@
     selectionRectMode,
     selectionKeyPressed,
     selectionMode,
-    resetSelectedElements,
+    unselectNodesAndEdges,
   } = useStore();
 
   let container: HTMLDivElement;
@@ -61,7 +61,7 @@
   function onClick(event: MouseEvent) {
     dispatch('pane:click', event);
 
-    resetSelectedElements();
+    unselectNodesAndEdges();
     selectionRectMode.set(null);
   }
 
@@ -80,7 +80,7 @@
 
     const { x, y } = getEventPosition(event, containerBounds);
 
-    resetSelectedElements();
+    unselectNodesAndEdges();
 
     selectionRect.set({
       width: 0,