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/javascript/dashboard/components/widgets/ChannelItem.vue

@@ -76,7 +76,7 @@ export default {
       if (key === 'email') {
         return this.enabledFeatures.channel_email;
       }
-      return ['website', 'twilio', 'api', 'whatsapp', 'sms'].includes(key);
+      return ['website', 'twilio', 'api', 'whatsapp', 'sms', 'telegram'].includes(key);
     },
   },
   methods: {

app/javascript/dashboard/components/widgets/Thumbnail.vue

@@ -35,6 +35,13 @@
       :style="badgeStyle"
       src="~dashboard/assets/images/channels/whatsapp.png"
     />
+    <img
+      v-if="badge === 'Channel::Telegram'"
+      id="badge"
+      class="source-badge"
+      :style="badgeStyle"
+      src="~dashboard/assets/images/channels/telegram.png"
+    />
     <div
       v-if="showStatusIndicator"
       :class="`source-badge user-online-status user-online-status--${status}`"