wip basics for bloc based state management

lib/state/infrastructure/loadable_state.dart

@@ -0,0 +1,31 @@
+
+class LoadableState<TState> {
+  final LoadingState loadingState;
+  final TState? data;
+
+  const LoadableState({required this.loadingState, required this.data});
+
+  LoadableState<TState> loading() =>
+      LoadableState<TState>(loadingState: LoadingState.loading, data: null);
+
+  LoadableState<TState> cached(TState state) =>
+      LoadableState<TState>(loadingState: LoadingState.loading, data: state);
+
+  LoadableState<TState> done(TState state) =>
+      LoadableState<TState>(loadingState: LoadingState.none, data: state);
+
+  LoadableState<TState> error(TState state) =>
+      LoadableState<TState>(loadingState: LoadingState.none, data: state);
+
+  bool isBackgroundLoading() =>
+      loadingState == LoadingState.loading && data != null;
+
+  bool hasStateData() =>
+      data != null;
+}
+
+enum LoadingState {
+  loading,
+  failed,
+  none,
+}