Add Gitaly diff stats RPC client
What does this MR do?
Adds a simple interface for Gitaly Diff Stats RPC.
What are the relevant issue numbers?
Requirement for https://gitlab.com/gitlab-org/gitlab-ce/issues/49399 https://gitlab.com/gitlab-org/gitlab-ce/issues/20282 and https://gitlab.com/gitlab-org/gitlab-ce/issues/19232
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides
Edited by Grzegorz Bizon