Improve UI performance by optimizing reactivity

- Replace `ref`s with `shallowRef` when deep reactivity is not needed.
- Replace `readonly`s with `shallowReadonly` where the goal is to only
  prevent `.value` mutation.
- Remove redundant `ref` in `SizeObserver.vue`.
- Remove redundant nested `ref` in `TooltipWrapper.vue`.
- Remove redundant `events` export from `UseCollectionState.ts`.
- Remove redundant `computed` from `UseCollectionState.ts`.
- Remove `timestamp` from `TreeViewFilterEvent` that becomes unnecessary
  after using `shallowRef`.
- Add missing unit tests for `UseTreeViewFilterEvent`.
- Add missing stub for `FilterChangeDetails`.

src/presentation/components/Scripts/View/Tree/TreeView/TreeView.vue

@@ -14,7 +14,7 @@
 <script lang="ts">
 import {
   defineComponent, onMounted, watch,
-  ref, PropType,
+  shallowRef, PropType,
 } from 'vue';
 import { TreeRootManager } from './TreeRoot/TreeRootManager';
 import TreeRoot from './TreeRoot/TreeRoot.vue';
@@ -53,7 +53,7 @@ export default defineComponent({
     },
   },
   setup(props, { emit }) {
-    const treeContainerElement = ref<HTMLElement | undefined>();
+    const treeContainerElement = shallowRef<HTMLElement | undefined>();
 
     const tree = new TreeRootManager();