Chore: Move conversationStats to a seperate module (#962)

* Chore: Move conversationStats to a seperate module

* Move toggleTyping to conversationTypingStatus

* Remove unused agentTyping flag

* Fix review comments

app/javascript/dashboard/store/modules/specs/conversationStats/mutations.spec.js

@@ -0,0 +1,20 @@
+import types from '../../../mutation-types';
+import { mutations } from '../../conversationStats';
+
+describe('#mutations', () => {
+  describe('#SET_CONV_TAB_META', () => {
+    it('set conversation stats correctly', () => {
+      const state = {};
+      mutations[types.SET_CONV_TAB_META](state, {
+        mine_count: 1,
+        unassigned_count: 1,
+        all_count: 2,
+      });
+      expect(state).toEqual({
+        mineCount: 1,
+        unAssignedCount: 1,
+        allCount: 2,
+      });
+    });
+  });
+});