Use buildifier to reformat all Bazel files

After updating to buildifier 6.3.3

Ran the following commands:
shopt -s globstar
buildifier --mode=fix --lint=fix **/BUILD.bazel
buildifier --mode=fix --lint=fix **/*.bzl

This mostly sorted the load statements.

Change-Id: I7da7513afbc147300cfecb38073ad52c05da2f16
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/763276
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
69 files changed