fix: request runtime config not work in sometimes

[yutingzhao1991]

类似之前的 umijs/plugin-request#12

不能直接在模块初始化的时候去初始化运行时配置，当用户的 app.ts 中依赖了该文件的情况下就该模块的初始化时间就会被提前，无法获取到运行时配置。

[codecov]

Codecov Report

Merging #86 into master will increase coverage by 0.26%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
+ Coverage   53.45%   53.72%   +0.26%     
==========================================
  Files          60       60              
  Lines        1214     1221       +7     
  Branches      337      338       +1     
==========================================
+ Hits          649      656       +7     
  Misses        565      565              

Impacted Files	Coverage Δ
packages/plugin-request/src/request.ts	93.93% <93.33%> (+0.71%)	⬆️

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