feat: Line Channel (#2904)

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

fixes: #2738

spec/controllers/webhooks/line_controller_spec.rb

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