Support the template registration which has a compressed format .tar.gz and tar.xz

### The required feature described as a wish

As a User/Admin/Operator I would like to register whose template format is

resolute-server-cloudimg-amd64.tar.gz
resolute-server-cloudimg-amd64-root.tar.xz

Currently Cloudstack supports the registration of template whose format is

resolute-server-cloudimg-amd64.img
resolute-server-cloudimg-amd64.qcow2
resolute-server-cloudimg-amd64.qcow2.bz2
resolute-server-cloudimg-amd64.xz

it will be useful for the admin user who just wants to quicky register a small-sized compressed cloud image

Ref
https://cloud-images.ubuntu.com/resolute/current/

首先跟踪 CloudStack 的模板注册路径，以及它如何识别 issue 中列出的当前支持的镜像格式。确认格式验证和归档处理发生的位置；当以 .tar.gz 和 .tar.xz 结尾的模板能够与现有格式一起注册，并且两个案例都有覆盖时，即视为完成。

由索引模型根据 Issue 内容生成。