added support for simultan downloads in files and talk, support for background downloads, enhanced loading in files with retry

lib/state/app/modules/files/data_provider/files_data_provider.dart

@@ -21,6 +21,7 @@ class FilesDataProvider {
     void Function(ListFilesResponse)? onCacheData,
     void Function(Object)? onError,
     bool renew = false,
+    void Function(int nextAttempt, int maxAttempts)? onRetry,
   }) => resolveFromCache<ListFilesResponse>(
     (onUpdate, onError) => ListFilesCache(
       path: path,
@@ -28,6 +29,7 @@ class FilesDataProvider {
       onCacheData: onCacheData,
       onError: onError,
       renew: renew,
+      onRetry: onRetry,
     ),
     onError: onError,
     operationName: 'listFiles',