chore: Handle attachments in Whatsapp Channel (#3299)

send and receive attachments in 360Dialog WhatsApp channels

Gemfile

@@ -144,6 +144,8 @@ group :test do
   gem 'cypress-on-rails', '~> 1.0'
   # fast cleaning of database
   gem 'database_cleaner'
+  # mock http calls
+  gem 'webmock'
 end
 
 group :development, :test do
@@ -171,5 +173,4 @@ group :development, :test do
   gem 'simplecov', '0.17.1', require: false
   gem 'spring'
   gem 'spring-watcher-listen'
-  gem 'webmock'
 end