Adds in buildifier bazel targets that autoformat/lint the entire
WORKSPACE. This can be invoked by running;
'bazel run //:buildifier'
or
'bazel run //:buildifier_test'
Change-Id: Iaaf7f6241e29894eca94aa6b5d0ca3b33255b7f7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/36160
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Keir Mierle <keir@google.com>