Introduce new TreeView UI component

Key highlights:

- Written from scratch to cater specifically to privacy.sexy's
  needs and requirements.
- The visual look mimics the previous component with minimal changes,
  but its internal code is completely rewritten.
- Lays groundwork for future functionalities like the "expand all"
  button a flat view mode as discussed in #158.
- Facilitates the transition to Vue 3 by omitting the Vue 2.0 dependent
  `liquour-tree` as part of #230.

Improvements and features:

- Caching for quicker node queries.
- Gradual rendering of nodes that introduces a noticable boost in
  performance, particularly during search/filtering.
  - `TreeView` solely governs the check states of branch nodes.

Changes:

- Keyboard interactions now alter the background color to highlight the
  focused item. Previously, it was changing the color of the text.
- Better state management with clear separation of concerns:
  - `TreeView` exclusively manages indeterminate states.
  - `TreeView` solely governs the check states of branch nodes.
  - Introduce transaction pattern to update state in batches to minimize
    amount of events handled.
- Improve keyboard focus, style background instead of foreground. Use
  hover/touch color on keyboard focus.
- `SelectableTree` has been removed. Instead, `TreeView` is now directly
  integrated with `ScriptsTree`.
- `ScriptsTree` has been refactored to incorporate hooks for clearer
  code and separation of duties.
- Adopt Vue-idiomatic bindings instead of keeping a reference of the
  tree component.
- Simplify and change filter event management.
- Abandon global styles in favor of class-scoped styles.
- Use global mixins with descriptive names to clarify indended
  functionality.

src/presentation/components/Scripts/View/Tree/TreeViewAdapter/TreeNodeMetadataConverter.ts

@@ -0,0 +1,33 @@
+import { NodeMetadata } from '../NodeContent/NodeMetadata';
+import { ReadOnlyTreeNode } from '../TreeView/Node/TreeNode';
+import { TreeInputNodeData } from '../TreeView/Bindings/TreeInputNodeData';
+
+export function getNodeMetadata(
+  treeNode: ReadOnlyTreeNode,
+): NodeMetadata {
+  if (!treeNode) { throw new Error('missing tree node'); }
+  const data = treeNode.metadata as NodeMetadata;
+  if (!data) {
+    throw new Error('Provided node does not contain the expected metadata.');
+  }
+  return data;
+}
+
+export function convertToNodeInput(metadata: NodeMetadata): TreeInputNodeData {
+  if (!metadata) { throw new Error('missing metadata'); }
+  return {
+    id: metadata.id,
+    children: convertChildren(metadata.children, convertToNodeInput),
+    data: metadata,
+  };
+}
+
+function convertChildren<TOldNode, TNewNode>(
+  oldChildren: readonly TOldNode[],
+  callback: (value: TOldNode) => TNewNode,
+): TNewNode[] {
+  if (!oldChildren || oldChildren.length === 0) {
+    return [];
+  }
+  return oldChildren.map((childNode) => callback(childNode));
+}