See https://github.com/silverstripeltd/open-sourcerers/issues/91
* Add `PreformattedEchoHandler`
cherry-picked from 4c3f3e6bea99b46b689e5b23d1bd1498a4ac696c
* Batch log messages for every 100 file.
Also make logger work for stdout
* Update src/Logging/PreformattedEchoHandler.php
Co-Authored-By: bergice <bergice@users.noreply.github.com>