chore(qiankun): microApp auto setLoading

[ycjcl868]

Close #233
ref: umijs/umi#4979 ，单独发不受 umi callback 影响

子应用默认情况下，会自动处理 loading

如果子应用需要精准控制 loading，通过

// app.ts
export const qiankun = {
   slave: {
      // 关闭自动 loading
      autoSetLanding: false
   }
}

在子应用页面中，单独调用 setLoading

// pages/Bar.tsx
import React from 'react';
import { useModel } from 'umi';

export default () => {
   const { setLoading } = useModel('@@qiankunStateFromMaster');
   React.useEffect(() => {
     setLoading(false);
   }, []);   
  ...
}

[codecov]

Codecov Report

Merging #293 into master will decrease coverage by 0.12%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
- Coverage   44.14%   44.01%   -0.13%     
==========================================
  Files          73       73              
  Lines        1767     1772       +5     
  Branches      493      496       +3     
==========================================
  Hits          780      780              
- Misses        987      992       +5     

Impacted Files	Coverage Δ
packages/plugin-qiankun/src/slave/lifecycles.ts	0.00% <0.00%> (ø)

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