Refactor repo type handling in download-deps.js

[finscn]

Refactor getGitUrl and getNormalizedOrigin functions to handle different repo types more clearly.

目前的版本只支持 git 或者 url+'.git' 不够通用.
不支持 纯https 的 url 形式.

本修改解决了这个问题.

现在可以用下面这种格式的 配置了:

{
    "from": {
        "type": "https",
        "url": "https://aaa.bbb/cccc/dddd/eeee/my-external",
        "checkout": "branch-test"
    }
}

其实理论上可以省略 type , 判断如果没有 type 且有 url 时, 直接使用 url.
但是我看你们的代码里 没有type 会抛出异常, 也就是说 在你们的原始设计里 type 是必选项. 所以我也就保留了type.
虽然有点冗余, 但是挺清晰, 也没什么不好.

Re: #

Changelog

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.