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/

首先追蹤 CloudStack 的模板註冊路徑，以及它如何辨識 issue 中列出的目前支援的映像格式。確認格式驗證和封存處理發生的位置；當以 .tar.gz 和 .tar.xz 結尾的模板能夠與現有格式一起註冊，並且兩個案例都有涵蓋時，即視為完成。

由索引模型根據 Issue 內容生成。