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

spec/controllers/webhooks/telegram_controller_spec.rb

@@ -0,0 +1,12 @@
+require 'rails_helper'
+
+RSpec.describe 'Webhooks::TelegramController', type: :request do
+  describe 'POST /webhooks/telegram/{:bot_token}' do
+    it 'call the telegram events job with the params' do
+      allow(Webhooks::TelegramEventsJob).to receive(:perform_later)
+      expect(Webhooks::TelegramEventsJob).to receive(:perform_later)
+      post '/webhooks/telegram/random_bot_token', params: { content: 'hello' }
+      expect(response).to have_http_status(:success)
+    end
+  end
+end