Punycode URI normalization (#2370)

* Fix #2119 - Whenever about to send a HTTP request, normalize the URI

* Add test for IDN request in FetchLinkCardService

* Perform IDN normalization on domains before they are stored in the DB

app/services/follow_remote_account_service.rb

@@ -73,7 +73,7 @@ class FollowRemoteAccountService < BaseService
   end
 
   def get_feed(url)
-    response = http_client.get(Addressable::URI.parse(url))
+    response = http_client.get(Addressable::URI.parse(url).normalize)
     [response.to_s, Nokogiri::XML(response)]
   end