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

app/models/channel/twilio_sms.rb

@@ -17,19 +17,16 @@
 #
 
 class Channel::TwilioSms < ApplicationRecord
+  include Channelable
+
   self.table_name = 'channel_twilio_sms'
 
-  validates :account_id, presence: true
   validates :account_sid, presence: true
   validates :auth_token, presence: true
   validates :phone_number, uniqueness: { scope: :account_id }, presence: true
 
   enum medium: { sms: 0, whatsapp: 1 }
 
-  belongs_to :account
-
-  has_one :inbox, as: :channel, dependent: :destroy
-
   def name
     medium == 'sms' ? 'Twilio SMS' : 'Whatsapp'
   end