Add proto for upload-to-GS phosphorous subcommand

Also add client offload directory as field in Config

R=zamorzaev@google.com

Bug: 1022986
Change-Id: I10a37e16778f75abf835df3a40ab1dcf9e749c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1984770
Commit-Queue: Jacob Kopczynski <jkop@chromium.org>
Tested-by: Jacob Kopczynski <jkop@chromium.org>
Reviewed-by: Alex Zamorzaev <zamorzaev@chromium.org>
7 files changed