- introduce view specific helper.mjs module
- clean up some imports

Bug: v8:10644
Change-Id: I0497c1a962c90f61f2beca667aca4a3f53a11e59
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2545705Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71269}