This uses tonic to generate the full set of gRPC clients for Yandex
Cloud. Includes some utility functions like an authentication
interceptor to make these actually work.
Since the upstream protos are exported regularly I've decided that the
versioning will simply be date-based.
The point of this is journaldriver integration, of course, hence also
the log-centric example code.
Change-Id: I00a615dcba80030e7f9bcfd476b2cfdb298f130d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8525
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
