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/NodeContent/Documentation/DocumentableNode.vue

@@ -0,0 +1,84 @@
+<template>
+  <div class="container">
+    <div class="header">
+      <div class="content">
+        <slot />
+      </div>
+      <ToggleDocumentationButton
+        v-if="docs && docs.length > 0"
+        v-on:show="isExpanded = true"
+        v-on:hide="isExpanded = false"
+      />
+    </div>
+    <div
+      v-if="docs && docs.length > 0 && isExpanded"
+      class="docs"
+      v-bind:class="{ 'docs-expanded': isExpanded, 'docs-collapsed': !isExpanded }"
+    >
+      <DocumentationText
+        :docs="docs"
+        class="text"
+        v-bind:class="{
+          expanded: isExpanded,
+          collapsed: !isExpanded,
+        }" />
+    </div>
+  </div>
+</template>
+
+<script lang="ts">
+import { defineComponent, ref, PropType } from 'vue';
+import DocumentationText from './DocumentationText.vue';
+import ToggleDocumentationButton from './ToggleDocumentationButton.vue';
+
+export default defineComponent({
+  components: {
+    DocumentationText,
+    ToggleDocumentationButton,
+  },
+  props: {
+    docs: {
+      type: Array as PropType<readonly string[]>,
+      required: true,
+    },
+  },
+  setup() {
+    const isExpanded = ref(false);
+
+    return {
+      isExpanded,
+    };
+  },
+});
+</script>
+
+<style scoped lang="scss">
+@use "@/presentation/assets/styles/main" as *;
+
+.container {
+  display: flex;
+  flex-direction: column;
+  *:not(:first-child) {
+    margin-left: 5px;
+  }
+  .header {
+    display: flex;
+    flex-direction: row;
+    .content {
+        flex: 1;
+    }
+  }
+  .docs {
+    background: $color-primary-darkest;
+    margin-top: 0.25em;
+    color: $color-on-primary;
+    text-transform: none;
+    padding: 0.5em;
+    &-collapsed {
+      display: none;
+    }
+    cursor: auto;
+    user-select: text;
+  }
+}
+</style>