refactor(flow): export useNodesState and useEdgesState separately from useVueFlow

* bind vueFlow instance to currentInstance when useVueFlow is called multiple times in a single setup call

Signed-off-by: Braks <78412429+bcakmakoglu@users.noreply.github.com>

src/shims-vue.d.ts

@@ -1,6 +1,14 @@
+import { UseVueFlow } from '~/types'
+
 declare module '*.vue' {
   import { DefineComponent } from 'vue'
   // eslint-disable-next-line @typescript-eslint/ban-types
   const component: DefineComponent<{}, {}, any>
   export default component
 }
+
+declare module '@vue/runtime-core' {
+  interface ComponentInternalInstance {
+    vueFlow: UseVueFlow
+  }
+}