feat: plugin-request for umi 3

[yutingzhao1991]

plugin-request 的样例都过了

[xiaohuoni]

好像用例不全，没体现runtime里面的配置，还有中间件的影响。不过这部分不知道算不算在这里面。（又看了几遍，还是觉得少了啥！先不管吧）

[yutingzhao1991]

好像用例不全，没体现runtime里面的配置，还有中间件的影响。不过这部分不知道算不算在这里面。

runtime 的有的，样例里面通过 mock 了不同的 runtime 配置。umi-request 中间件也有样例测试的。

[sorrycc]

ci 的问题 merge 下 master，之前的 yarn.lock 有问题。

[sorrycc]

ci 没过。

[sorrycc]

外部的包别用 ayarn，直接用 yarn 。

[codecov]

Codecov Report

Merging #22 into master will increase coverage by 10.46%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #22       +/-   ##
===========================================
+ Coverage   33.61%   44.08%   +10.46%     
===========================================
  Files          21       23        +2     
  Lines         351      431       +80     
  Branches       70       93       +23     
===========================================
+ Hits          118      190       +72     
- Misses        233      240        +7     
- Partials        0        1        +1     

Impacted Files	Coverage Δ
packages/plugin-model/src/utils/index.ts	0.00% <0.00%> (ø)	⬆️
packages/plugin-request/src/index.ts	80.95% <0.00%> (ø)
packages/plugin-request/src/request.ts	93.22% <0.00%> (ø)

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[yutingzhao1991]

@sorrycc CI 过了，把 mock 改为局部的手动 mock 了，这样就不会影响其它测试样例。