Adding pagination to member requests page (#1234)

# What it does

Adds pagination for members to the admin -> reports -> member requests
page

# Why it is important

Allows better user experience when viewing membership requests. Resolves
this
[issue](#1213)

# UI Change Screenshot

Before:

![image](https://github.com/chicago-tool-library/circulate/assets/2738059/b896f17a-7e35-4bbd-9ade-b46b026b9a07)

After:

![image](https://github.com/chicago-tool-library/circulate/assets/2738059/314894a2-6c76-4eb5-b6f9-ad5e7681caca)

# Implementation notes

Leveraged existing code in admin -> reports -> membership to add
feature.

# Your bandwidth for additional changes to this PR

I have the time and interest to make additional changes to this PR based
on feedback.

app/controllers/admin/reports/member_requests_controller.rb

@@ -1,10 +1,17 @@
 module Admin
   module Reports
     class MemberRequestsController < BaseController
+      include Pagy::Backend
       include MemberOrdering
 
       def index
         @members = Member.open.order(index_order)
+
+        respond_to do |format|
+          format.html do
+            @pagy, @members = pagy_arel(@members, items: 100)
+          end
+        end
       end
     end
   end

app/views/admin/reports/member_requests/index.html.erb

@@ -26,4 +26,6 @@
       <%= tag.div member.desires, class: "responsive-table-cell" %>
     <% end %>
   </div>
+
+  <%== pagy_bootstrap_nav(@pagy) %>
 <% end %>