docs: public List<URL> scan(Predicate<String> filter)
      {
          List<URL> discoveredURLs = new ArrayList<>(128);
  
          // For each Forge addon...
          for (Addon addon : furnace.getAddonRegistry().getAddons(AddonFilters.allStarted()))
          {
              List<String> filteredResourcePaths = filterAddonResources(addon, filter);
              for (String filePath : filteredResourcePaths)
              {
                  URL ruleFile = addon.getClassLoader().getResource(filePath);
                  if (ruleFile != null)
                      discoveredURLs.add(ruleFile);
              }
          }
          return discoveredURLs;
      }