[MM-57418] Implement support for defining plugin settings sections (#27654)

* Implement support for defining plugin settings sections

* Implement custom plugin configuration sections

* Tests

* Update test

* Improvements

webapp/platform/types/src/plugins.ts

@@ -44,6 +44,17 @@ export type PluginSettingsSchema = {
     header: string;
     footer: string;
     settings: PluginSetting[];
+    sections?: PluginSettingSection[];
+};
+
+export type PluginSettingSection = {
+    key: string;
+    title?: string;
+    subtitle?: string;
+    settings: PluginSetting[];
+    header?: string;
+    footer?: string;
+    custom?: boolean;
 };
 
 export type PluginSetting = {