public Class<? extends EventLoopGroup> eventLoopGroupType() {
        return ensureSupported(eventLoopGroupType);
    }
Provides the properties required by {@link TransportType} by loading /dev/epoll and io_uring transport
classes dynamically, so that Armeria does not have hard dependencies on them.
See: <a href="https://github.com/line/armeria/issues/3243">line/armeria#3243</a>
core/src/main/java/com/linecorp/armeria/internal/common/util/TransportTypeProvider.java