Implement Gitaly refs client
What does this MR do?
Implement Gitaly refs client with initial operations default_branch_name, branch_names and tag_names.
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
Provide client code for https://gitlab.com/gitlab-org/gitaly/issues/65
Does this MR meet the acceptance criteria?
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Changelog entry added [ ] Documentation created/updated[ ] API support added- Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together