chrisptang/cat repository overview

build from:https://github.com/chrisptang/cat/tree/test/chrisptang⁠

originally from:https://github.com/dianping/cat⁠, version 3.0.0

Added feature:

1. Smaller image size because we are using tomcat:jdk8-adoptopenjdk-hotspot rather than linux(ubuntu)
2. Webhook alarm sender, used to send alarms via webhook. e.g.: AWS SMS/Dingtalk Bot/WeChat Business Bot.