authfs: create a chunked reader with fs-verity verification am: f77c5729a6 am: 37d30d4f6b am: f9b57d6f3f

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

Change-Id: Ic08202dc322e6a91f0a703bfed9ace0177d83fcf
tree: 37415e71e941c2aecb2ee096ad6599bffeaab9bc
  1. authfs/
  2. docs/
  3. .clang-format
  4. PREUPLOAD.cfg