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

packages/wyatt_bloc_helper/example/lib/counter/repository/counter_repository.dart

@@ -0,0 +1,27 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+class CounterRepository {
+  int increment(int before) {
+    final after = before + 1;
+    return after;
+  }
+
+  int decrement(int before) {
+    final after = before - 1;
+    return after;
+  }
+}