feat: Umi 3 SSR

[ycjcl868]

《🎉 发布 Umi 3.2.0 — 可能是西湖区最好用的 SSR 框架》

感谢 @i5ting @zhangyuang @eligao @hi-yinyue 对 Umi 3 SSR 开发过程中的大力支持！

『RFC』 ：Close #4500
Close #4357
Close #3976
Close #3758
Close #3757
Close #3748
Close #3711
Close #4270
Close #3481
Close #3974
Close #1363
Close #2963
Close #659
Close #4119
Close #377
Close #3348
Close #3936
Close #2970
Close #3879
Close #3849
Close #4586
Close #3862
Close #3857
Close #4029
Close #1048
Close #3762
Close #3551
Close #3938
Close umijs/umi-server#22
Close umijs/umi-server#59
Close umijs/umi-server#25
Close umijs/umi-example-ssr#12
Close umijs/umi-example-ssr-with-egg#21
Close umijs/umi-example-ssr-with-egg#17
Close umijs/umi-example-ssr-with-egg#11
Close umijs/umi-next#12

ref: liady/webpack-node-externals#66

阿里云函数计算预览：http://umi.ssr-fc.com/

怎样使用

只需要配置（不再需要 umi-server，开箱即用）：

// .umirc.ts
export default {
  ssr: {},
}

然后 umi dev，打开即是 SSR 后的。

使用预渲染：

// .umirc.ts
export default {
    ssr: {}
+  exportStatic: {},
}

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

[codecov]

Codecov Report

Merging #4499 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4499   +/-   ##
=======================================
  Coverage   82.31%   82.31%           
=======================================
  Files         150      150           
  Lines        3200     3200           
  Branches      812      812           
=======================================
  Hits         2634     2634           
  Misses        561      561           
  Partials        5        5           

---

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[ycjcl868]

@kuitos cc 看对微前端有影响没