[Feature] Email collect message hooks (#331)

- Add email collect hook on creating conversation
- Merge contact if it already exist

spec/services/message_templates/template/email_collect_spec.rb

@@ -0,0 +1,12 @@
+require 'rails_helper'
+
+describe ::MessageTemplates::Template::EmailCollect do
+  context 'when this hook is called' do
+    let(:conversation) { create(:conversation) }
+
+    it 'creates the email collect messages' do
+      described_class.new(conversation: conversation).perform
+      expect(conversation.messages.count).to eq(3)
+    end
+  end
+end