WIP: Refactor nrm

[CaptainOfPhB]

This is a Work In Progress merge request, CAN NOT merge directly now.

Motivation

When I tried to add some test cases for cli.js, I found some test cases will run fail for some reason, for example, npm.config.get('registry') will get a wrong registry(https://registry.yarnpkg.com/) sometimes, I am sure about that the registry(https://registry.yarnpkg.com/) does not exist in any related configuration file.

In addition, use npm lib to write .npmrcfile is unnecessary, fs.writeFileSync is enough. And the programmatic API was removed innpm from v8.0.0, as we can see in index.js, so, the var npm = require('npm') usage is not recommended and already has been deprecated.

I will do

• remove npm dependency
• replace request with node-fetch
• split project files and make the code more concise
• add more test cases

[CaptainOfPhB]

please review code @i5ting @Pana

[i5ting]

1、tap测试是没有问题
2、test-console用起来没有coffee用的直观
3、可以把sinon引入，理解一下spies，stubs，mocks，测试用例代码看着可读性还需要提升。

[CaptainOfPhB]

1. test-console 可以测试单个函数的输出，看了下 coffee，类似于 child_process，直接从命令行作为入口，测试输出，这和测试单个函数并无明显区别。
2. tap 已具备 mock 功能，虽然没有 sinon 断言 spy 函数被调用那样便捷的 api，但是通过 test-console 测试 mock 函数的输出也可以达到同样的效果，即 mock 的函数被调用了。

[i5ting]

功能是类似的，可读性上是有差异的。另外我理解coffee对跨平台做了很多兼容。

tap的mock功能我还没看到，https://github.com/tapjs/node-tap/blob/main/package.json#L22依赖有点多。

先合并，一点点优化吧

[CaptainOfPhB]

OK，谢狼叔指点。