N°5298 - Merge work from 9bf0addc9c with changes from the WIP CKEditor build repo

js/ckeditor/build/plugins/insert-html/insert-html.plugin.d.ts

@@ -0,0 +1,9 @@
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+/**
+ * InsertHtml Plugin.
+ *
+ */
+export default class InsertHtml extends Plugin {
+    static get pluginName(): string;
+    init(): void;
+}