public static @NotNull List<ExtensionFileNameMatcher> getExtensionMatchers(@NotNull FileType fileType) {
    return getMatchers(fileType).stream()
      .filter(matcher -> matcher instanceof ExtensionFileNameMatcher)
      .map(matcher -> (ExtensionFileNameMatcher)matcher)
      .toList();
  }
public static @NotNull List<ExtensionFileNameMatcher> getExtensionMatchers(@NotNull FileType fileType)