Build API: Add ability to hide services/methods.

BUG=None
TEST=./generate.sh

Change-Id: Id9de4544d132b073e6bfe54bec3251bc19338990
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2728532
Auto-Submit: Alex Klein <saklein@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
5 files changed