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/factories/channel/channel_line.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :channel_line, class: 'Channel::Line' do
+    line_channel_id { SecureRandom.uuid }
+    line_channel_secret { SecureRandom.uuid }
+    line_channel_token { SecureRandom.uuid }
+    inbox
+    account
+  end
+end