imapnotify: add `extraConfig` account option

modules/services/imapnotify-accounts.nix

@@ -29,5 +29,12 @@ with lib;
       example = [ "Inbox" "[Gmail]/MyLabel" ];
       description = "IMAP folders to watch.";
     };
+
+    extraConfig = mkOption {
+      type = with types; attrsOf (oneOf [ bool int str ]);
+      default = { };
+      example = { wait = 10; };
+      description = "Additional configuration to add for this account.";
+    };
   };
 }

modules/services/imapnotify.nix

@@ -56,7 +56,7 @@ let
       onNewMail = account.imapnotify.onNotify;
     } // optionalAttrs (account.imapnotify.onNotifyPost != "") {
       onNewMailPost = account.imapnotify.onNotifyPost;
-    }));
+    } // account.imapnotify.extraConfig));
 
 in {
   meta.maintainers = [ maintainers.nickhu ];