Feature: Send chat transcript via email (#1152)

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/views/mailers/conversation_reply_mailer/conversation_transcript.html.erb

@@ -0,0 +1,20 @@
+<% @messages.each do |message| %>
+  <tr>
+    <td>
+      <b><%= message.sender&.try(:available_name) || message.sender&.name || '' %></b>
+    </td>
+  </tr>
+  <tr>
+    <td style="padding-bottom: 16px;">
+      <% if message.content %>
+        <%= message.content %>
+      <% end %>
+      <% if message.attachments %>
+        <% message.attachments.each do |attachment| %>
+          Attachment [<a href="<%= attachment.file_url %>" _target="blank">Click here to view</a>]
+        <% end %>
+      <% end %>
+      <br />
+    </td>
+  </tr>
+<% end %>