Add E2EE API (#13820)

spec/models/device_spec.rb

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+require 'rails_helper'
+
+RSpec.describe Device, type: :model do
+
+end

spec/models/encrypted_message_spec.rb

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+require 'rails_helper'
+
+RSpec.describe EncryptedMessage, type: :model do
+
+end

spec/models/one_time_key_spec.rb

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+require 'rails_helper'
+
+RSpec.describe OneTimeKey, type: :model do
+
+end

spec/models/system_key_spec.rb

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+require 'rails_helper'
+
+RSpec.describe SystemKey, type: :model do
+
+end