chore: Provider APIs for SMS Channel - Bandwidth (#3889)

fixes: #3888

db/schema.rb

@@ -228,6 +228,16 @@ ActiveRecord::Schema.define(version: 2022_01_31_081750) do
     t.index ["line_channel_id"], name: "index_channel_line_on_line_channel_id", unique: true
   end
 
+  create_table "channel_sms", force: :cascade do |t|
+    t.integer "account_id", null: false
+    t.string "phone_number", null: false
+    t.string "provider", default: "default"
+    t.jsonb "provider_config", default: {}
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["phone_number"], name: "index_channel_sms_on_phone_number", unique: true
+  end
+
   create_table "channel_telegram", force: :cascade do |t|
     t.string "bot_name"
     t.integer "account_id", null: false