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/composables/useInbox.js

@@ -125,6 +125,10 @@ export const useInbox = () => {
     return channelType.value === INBOX_TYPES.INSTAGRAM;
   });
 
+  const isAVoiceChannel = computed(() => {
+    return channelType.value === INBOX_TYPES.VOICE;
+  });
+
   return {
     inbox,
     isAFacebookInbox,
@@ -142,5 +146,6 @@ export const useInbox = () => {
     is360DialogWhatsAppChannel,
     isAnEmailChannel,
     isAnInstagramChannel,
+    isAVoiceChannel,
   };
 };