[Feature] Email collect message hooks (#331)

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

app/services/message_templates/template/email_collect.rb

@@ -0,0 +1,56 @@
+class MessageTemplates::Template::EmailCollect
+  pattr_initialize [:conversation!]
+
+  def perform
+    ActiveRecord::Base.transaction do
+      conversation.messages.create!(typical_reply_message_params)
+      conversation.messages.create!(ways_to_reach_you_message_params)
+      conversation.messages.create!(email_input_box_template_message_params)
+    end
+  rescue StandardError => e
+    Raven.capture_exception(e)
+    true
+  end
+
+  private
+
+  delegate :contact, :account, to: :conversation
+  delegate :inbox, to: :message
+
+  def typical_reply_message_params
+    content = I18n.t('conversations.templates.typical_reply_message_body',
+                     account_name: account.name)
+
+    {
+      account_id: @conversation.account_id,
+      inbox_id: @conversation.inbox_id,
+      message_type: :template,
+      content: content
+    }
+  end
+
+  def ways_to_reach_you_message_params
+    content = I18n.t('conversations.templates.ways_to_reach_you_message_body',
+                     account_name: account.name)
+
+    {
+      account_id: @conversation.account_id,
+      inbox_id: @conversation.inbox_id,
+      message_type: :template,
+      content: content
+    }
+  end
+
+  def email_input_box_template_message_params
+    content = I18n.t('conversations.templates.email_input_box_message_body',
+                     account_name: account.name)
+
+    {
+      account_id: @conversation.account_id,
+      inbox_id: @conversation.inbox_id,
+      message_type: :template,
+      content_type: :input_email,
+      content: content
+    }
+  end
+end