feat: outbound voice call essentials (#12782)

- Enables outbound voice calls in voice channel . We are only caring
about wiring the logic to trigger outgoing calls to the call button
introduced in previous PRs. We will connect it to call component in
subsequent PRs

ref: #11602 

## Screens

<img width="2304" height="1202" alt="image"
src="https://github.com/user-attachments/assets/b91543a8-8d4e-4229-bd80-9727b42c7b0f"
/>

<img width="2304" height="1200" alt="image"
src="https://github.com/user-attachments/assets/1a1dad2a-8cb2-4aa2-9702-c062416556a7"
/>

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Vishnu Narayanan <vishnu@chatwoot.com>

app/javascript/dashboard/components-next/message/constants.js

@@ -73,3 +73,16 @@ export const MEDIA_TYPES = [
   ATTACHMENT_TYPES.AUDIO,
   ATTACHMENT_TYPES.IG_REEL,
 ];
+
+export const VOICE_CALL_STATUS = {
+  IN_PROGRESS: 'in-progress',
+  RINGING: 'ringing',
+  COMPLETED: 'completed',
+  NO_ANSWER: 'no-answer',
+  FAILED: 'failed',
+};
+
+export const VOICE_CALL_DIRECTION = {
+  INBOUND: 'inbound',
+  OUTBOUND: 'outbound',
+};