feat: Support for Whatsapp Cloud API (#4938)

Ability to configure Whatsapp Cloud API Inboxes

fixes: #4712

spec/factories/channel/channel_whatsapp.rb

@@ -36,11 +36,17 @@ FactoryBot.define do
 
     transient do
       sync_templates { true }
+      validate_provider_config { true }
     end
 
     before(:create) do |channel_whatsapp, options|
       # since factory already has the required message templates, we just need to bypass it getting updated
       channel_whatsapp.define_singleton_method(:sync_templates) { return } unless options.sync_templates
+      channel_whatsapp.define_singleton_method(:validate_provider_config) { return } unless options.validate_provider_config
+      if channel_whatsapp.provider == 'whatsapp_cloud'
+        channel_whatsapp.provider_config = { 'api_key' => 'test_key', 'phone_number_id' => '123456789', 'business_account_id' => '123456789',
+                                             'webhook_verify_token': 'test_token' }
+      end
     end
 
     after(:create) do |channel_whatsapp|