Support mixin `@Ctx`

example

// import something
const app = new Koa() 
app.use(ctx=>{
 ctx.foo = 123
})

class Example {
  @Get('/xxx')
  foo(@Ctx() ctx) {
    console.log(ctx.foo) // why undefined ???
  }
}

useKoaServer(app, {
  controllers:  [Example]
})

[crycime]

I also have this problem.

[github-actions[bot]]

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