feat: Telegram Channel (#2901)

- Ability to configure telegram bots as a channel in chatwoot
- Receive a message sent to the telegram bot in chatwoot
- Ability to reply to telegram users from chatwoot
- Receive attachment messages in chatwoot

fixes: #1843

.rubocop.yml

@@ -100,6 +100,7 @@ Metrics/AbcSize:
     - 'app/controllers/concerns/auth_helper.rb'
     - 'db/migrate/20190819005836_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb'
     - 'db/migrate/20161123131628_devise_token_auth_create_users.rb'
+    - 'app/controllers/api/v1/accounts/inboxes_controller.rb'
 Metrics/CyclomaticComplexity:
   Max: 7
   Exclude: