feat(bloc): add a lot of docs, fix onWrap, and add repo provider

packages/wyatt_bloc_helper/example/lib/counter/bloc/counter_bloc.dart

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+import 'package:bloc_helper_example/counter/repository/counter_repository.dart';
 import 'package:equatable/equatable.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
@@ -21,14 +22,16 @@ part 'counter_event.dart';
 part 'counter_state.dart';
 
 class CounterBloc extends Bloc<CounterEvent, CounterState> {
-  CounterBloc() : super(const CounterInitial()) {
+  final CounterRepository counterRepository;
+
+  CounterBloc(this.counterRepository) : super(const CounterInitial()) {
     
     on<CounterIncrement>((event, emit) {
-      emit(CounterModified(state.count + 1));
+      emit(CounterModified(counterRepository.increment(state.count)));
     });
 
     on<CounterDecrement>((event, emit) {
-      emit(CounterModified(state.count - 1));
+      emit(CounterModified(counterRepository.decrement(state.count)));
     });
   }
 }