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>

tailwind.config.js

@@ -31,6 +31,7 @@ const tailwindConfig = {
     './app/javascript/survey/**/*.vue',
     './app/javascript/dashboard/components-next/**/*.vue',
     './app/javascript/dashboard/helper/**/*.js',
+    './app/javascript/dashboard/composables/**/*.js',
     './app/javascript/dashboard/components-next/**/*.js',
     './app/javascript/dashboard/routes/dashboard/**/**/*.js',
     './app/views/**/*.html.erb',