[request] CLI register page module to current router

I think `ionic g pg` command should page module to current router.
Now, all page module registered to `src/app/app-routing.module.ts` .

For example:
in tabs template, `$ ionic g pg tab1/sample` register `SamplePageModule` to `src/app/app-routing.module.ts`. I expect register to `src/tab1/tab1.module.ts`. `generate pipe` works like this.

Thanks.