Create UI Icons module and display bootstrap icons

src/Controller/IconDisplayController.php

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+<?php
+
+
+namespace Drupal\ui_icons\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+
+/**
+ * Class IconDisplayController.
+ */
+class IconDisplayController extends ControllerBase
+{
+
+  /**
+   * Display icons.
+   *
+   * @return array
+   *   Return render array.
+   */
+  public function display()
+  {
+    $build = [];
+    $iconsets = \Drupal::service('strategy.manager.iconset')->getIconsets();
+    foreach ($iconsets as $iconset_id=>$label) {
+      $iconset = \Drupal::service('strategy.manager.iconset')->getInstance($iconset_id);
+      $icons = $iconset->getIcons();
+      $build[] = [
+        '#type' => 'html_tag',
+        '#tag' => 'h2',
+        '#value' => $label,
+];
+    foreach ($icons as $icon_id => $icon) {
+        $build[] = $iconset->build($icon_id);
+      }
+}
+    return $build;
+  }
+
+}

src/Plugin/IconHandler/CustomIconHandler.php

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+<?php

ui_icons.iconset.yml

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+bootstrap_icons:
+  label: 'Bootstrap Icons'
+  plugin: 'svg'
+  assets:
+    - '/libraries/bootstrap-icons/house.svg'
+    - '/libraries/bootstrap-icons/people.svg'

ui_icons.info.yml

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+name: 'UI Icons'
+type: module
+description: 'A custom module to display icons using Iconset'
+core_version_requirement: ^9 || ^10
+package: Custom
+dependencies:
+  - iconset:iconset
+

ui_icons.routing.yml

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+ui_icons_display.display:
+  path: '/admin/config/media/iconset/icon-display'
+  defaults:
+    _controller: '\Drupal\ui_icons\Controller\IconDisplayController::display'
+    _title: 'Bootstrap Icon Display'
+  requirements:
+    _permission: 'access content'