feat: retrieve organization subscriptions list api.

feat: subscriptions reducers.

client/src/store/subscription/subscription.reducer.js

@@ -0,0 +1,19 @@
+import { createReducer } from '@reduxjs/toolkit';
+import t from 'store/types';
+
+const initialState = {
+  data: {},
+};
+
+export default createReducer(initialState, {
+
+  [t.SET_PLAN_SUBSCRIPTIONS_LIST]: (state, action) => {
+    const { subscriptions } = action.payload;
+    const _data = {};
+
+    subscriptions.forEach((subscription) => {
+      _data[subscription.id] = subscription;
+    });
+    state.data = _data;
+  },
+});