feat: HMAC verification for web widget (#1643)

* feat: HMAC verification for web widget. Let you verify the authenticated contact via HMAC on the web widget to prevent data tampering.
* Add docs for identity-validation

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/widget/store/modules/specs/conversation/mutations.spec.js

@@ -1,4 +1,4 @@
-import { mutations } from '../../conversation';
+import { mutations } from '../../conversation/mutations';
 
 const temporaryMessagePayload = {
   content: 'hello',
@@ -156,4 +156,12 @@ describe('#mutations', () => {
       });
     });
   });
+
+  describe('#clearConversations', () => {
+    it('clears the state', () => {
+      const state = { conversations: { 1: { id: 1 } } };
+      mutations.clearConversations(state);
+      expect(state.conversations).toEqual({});
+    });
+  });
 });