update(hooks): add elementsProcessed event hook

* triggered after elements have been processed and updated in store
* add missing selection change trigger to store

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

src/composables/useHooks.ts

@@ -17,6 +17,7 @@ export const createHooks = (): FlowHooks => ({
   connectStart: createEventHook(),
   connectStop: createEventHook(),
   connectEnd: createEventHook(),
+  elementsProcessed: createEventHook(),
   load: createEventHook(),
   move: createEventHook(),
   moveStart: createEventHook(),