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

app/controllers/webhooks/telegram_controller.rb

@@ -0,0 +1,6 @@
+class Webhooks::TelegramController < ActionController::API
+  def process_payload
+    Webhooks::TelegramEventsJob.perform_later(params.to_unsafe_hash)
+    head :ok
+  end
+end