authfs: create a chunked reader with fs-verity verification am: f77c5729a6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/1501599

Change-Id: Ib4591f20bddb1d03079e39fcc647bed0c2b13d2e
tree: 37415e71e941c2aecb2ee096ad6599bffeaab9bc
  1. authfs/
  2. docs/
  3. .clang-format
  4. PREUPLOAD.cfg