DEV: Move UserApiKey scopes to dedicated table (#10704)

This has no functional impact yet, but it is the first step in adding more granular scopes to UserApiKeys

app/models/user_api_key_scope.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class UserApiKeyScope < ActiveRecord::Base
+end
+
+# == Schema Information
+#
+# Table name: user_api_key_scopes
+#
+#  id              :bigint           not null, primary key
+#  user_api_key_id :integer          not null
+#  name            :string           not null
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#
+# Indexes
+#
+#  index_user_api_key_scopes_on_user_api_key_id  (user_api_key_id)
+#