It knows how to interpret configuration files written in Starlark-based
DSL and produce a bunch of protobuf messages as a result.

Will be used to generate various infra configs. In particular, will be
used by infra developers (to update configs), by PRESUBMIT.py on dev
machines (to verify configs before uploading CLs) and by bots (to verify
configs before submitting CLs).

R=tandrii@chromium.org
BUG=833946

Change-Id: Iceec7d808ce180f7d4a341fab8b5ce11933c2a6b
Reviewed-on: https://chromium-review.googlesource.com/c/1444499
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>