clear data of isolated containers; improved tab handling/state/duplication;

packages/flutter_mozilla_components/lib/src/domain/services/gecko_delete_browser_data.dart

@@ -37,4 +37,8 @@ class GeckoDeleteBrowserDataService {
   Future<void> deleteDownloads() {
     return _api.deleteDownloads();
   }
+
+  Future<void> clearDataForContext(String contextId) {
+    return _api.clearDataForSessionContext(contextId);
+  }
 }

packages/flutter_mozilla_components/lib/src/domain/services/gecko_tab.dart

@@ -180,4 +180,14 @@ class GeckoTabService {
       alternativeUrl: alternativeUrl?.toString(),
     );
   }
+
+  Future<List<String>> addMultipleTabs({
+    required List<AddTabParams> tabs,
+    String? selectTabId,
+  }) {
+    return _api.addMultipleTabs(
+      tabs: tabs,
+      selectTabId: selectTabId,
+    );
+  }
 }