Client implementation GetRawChanges
What does this MR do?
Implements the changes required for the client to request raw changes from Gitaly. Its behind a feature flag, so no changelog entry is included.
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Squashed related commits together
What are the relevant issue numbers?
Part of gitaly#1138 (closed)