feat: add ctx.forward api

[czy88840616]

Checklist

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

Affected core subsystem(s)

Description of change

[czy88840616]

#3121

[waitingsong]

直接调用？

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (c6d8317) 81.83% compared to head (4f0521f) 81.87%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3133      +/-   ##
==========================================
+ Coverage   81.83%   81.87%   +0.03%     
==========================================
  Files         438      438              
  Lines       15936    15960      +24     
  Branches     3773     3781       +8     
==========================================
+ Hits        13042    13068      +26     
+ Misses       2626     2624       -2     
  Partials      268      268              

Files Changed	Coverage Δ
packages/web-koa/src/framework.ts	79.50% <100.00%> (+2.44%)	⬆️
packages/web/app/extend/context.js	85.29% <100.00%> (+7.03%)	⬆️

... and 1 file with indirect coverage changes

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[czy88840616]

@waitingsong 直接调也可以，本质是一样的，就是要互相依赖了，对标 java 的话统一 api 就行了。