feat: Add support for API key authentication in Twilio (#7523)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

db/migrate/20230714054138_add_api_key_sid_to_twilio_sms.rb

@@ -0,0 +1,5 @@
+class AddApiKeySidToTwilioSms < ActiveRecord::Migration[7.0]
+  def change
+    add_column :channel_twilio_sms, :api_key_sid, :string
+  end
+end