Results 19 issues of sasezaki

This PR requests adding checkstyle output feature. I need checkstyle output to work with [cs2pr](https://github.com/staabm/annotate-pull-request-from-checkstyle), and other QA tools. Notes: This PR also inclueds cs-fix

Huge memory usage, despite using SapiStreamEmitter When using Zend\Diactoros\Server with `->setEmitter(new \Zend\Diactoros\Response\SapiStreamEmitter());`, it is still huge memory usage. here is reproduce code. ```php

refs. https://github.com/phpstan/phpstan-src/pull/181

Hi, chobie. Could you provide link to https://github.com/bwoebi/php-uv on README ? bwoebi/php-uv is forks & currently maintained for PHP 7. I think you currently have no motivation about php-uv. so,...

current Adaptor definision only contains only abstract methods. I assume there is no reason defined as Abstract class.

## Refactor: Cut Redundant Dependency in order to use as Standalone. When using Paginator class as Dependency, there is problem. - A lot of method is defined, regardless of whether...

awaiting author updates