fix: Add support for named parameter templates in WhatsApp (#11198)

The expected payload on WhatsApp Cloud API is the following. 
```json
{ 
  "template": {
    "name": "TEMPLATE_NAME",
    "language": {
      "code": "LANGUAGE_AND_LOCALE_CODE"
    },
    "components": [
         "<NAMED_PARAMETER_INPUT>",
         "<POSITIONAL_PARAMETER_INPUT>"
     ]
  }
}
```
Named templates expect a `parameter_name`

```json
{
   "type": "body",
    "parameters": [
      {
        "type": "text",
        "parameter_name": "customer_name",
        "text": "John"
      },
      {
        "type": "text",
        "parameter_name": "order_id",
        "text": "9128312831"
      }        
    ]
}
```

In this PR, we would check if the template is a name template, then we
would send the `parameter_name` as well.

Reference: https://github.com/chatwoot/chatwoot/issues/10886

app/services/contacts/contactable_inboxes_service.rb

@@ -42,20 +42,20 @@ class Contacts::ContactableInboxesService
   end
 
   def email_contactable_inbox(inbox)
-    return unless @contact.email
+    return if @contact.email.blank?
 
     { source_id: @contact.email, inbox: inbox }
   end
 
   def whatsapp_contactable_inbox(inbox)
-    return unless @contact.phone_number
+    return if @contact.phone_number.blank?
 
     # Remove the plus since thats the format 360 dialog uses
     { source_id: @contact.phone_number.delete('+'), inbox: inbox }
   end
 
   def sms_contactable_inbox(inbox)
-    return unless @contact.phone_number
+    return if @contact.phone_number.blank?
 
     { source_id: @contact.phone_number, inbox: inbox }
   end