[skrive] Initial binary reader plumbing

TBR=
Change-Id: Ib94516bfba881fd3fdd7b09631f14366f6ac98da
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/295573
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
8 files changed