feat: Voice channel creation Flow (#11775)

This PR introduces a new channel type for voice conversations.

ref: #11481 

## Changes

- Add database migration for channel_voice table with phone_number and
provider_config
- Create Channel::Voice model with E.164 phone number validation and
Twilio config validation
- Add voice channel association to Account model
- Extend inbox helpers and types to support voice channels
- Add voice channel setup UI with Twilio configuration form
- Include voice channel in channel factory and list components
- Add API routes and store actions for voice channel creation
- Add comprehensive translations for voice channel management

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/dashboard/store/modules/specs/inboxes/actions.spec.js

@@ -62,6 +62,28 @@ describe('#actions', () => {
     });
   });
 
+  describe('#createVoiceChannel', () => {
+    it('sends correct actions if API is success', async () => {
+      axios.post.mockResolvedValue({ data: inboxList[0] });
+      await actions.createVoiceChannel({ commit }, inboxList[0]);
+      expect(commit.mock.calls).toEqual([
+        [types.default.SET_INBOXES_UI_FLAG, { isCreating: true }],
+        [types.default.ADD_INBOXES, inboxList[0]],
+        [types.default.SET_INBOXES_UI_FLAG, { isCreating: false }],
+      ]);
+    });
+    it('sends correct actions if API is error', async () => {
+      axios.post.mockRejectedValue({ message: 'Incorrect header' });
+      await expect(actions.createVoiceChannel({ commit })).rejects.toThrow(
+        Error
+      );
+      expect(commit.mock.calls).toEqual([
+        [types.default.SET_INBOXES_UI_FLAG, { isCreating: true }],
+        [types.default.SET_INBOXES_UI_FLAG, { isCreating: false }],
+      ]);
+    });
+  });
+
   describe('#createFBChannel', () => {
     it('sends correct actions if API is success', async () => {
       axios.post.mockResolvedValue({ data: inboxList[0] });