public Mono<Boolean> isAdminRankHigherThanRank(@NotNull Long adminId, @NotNull Integer rank) {
        try {
            Validator.notNull(rank, "rank");
        } catch (ResponseException e) {
            return Mono.error(e);
        }
        return queryHighestRankByAdminId(adminId).map(adminRank -> adminRank > rank);
    }
@param adminService is lazy because: AdminService -> AdminRoleService -> AdminService
turms-service/src/main/java/im/turms/service/domain/admin/service/AdminRoleService.java