Add fields to RawBlame RPC for markUnblamableLines and markIgnoredLines
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=525099) </details> <!--IssueSummary end--> Add `mark_unblamable_lines` and `mark_ignored_lines` fields to the RawBlame RPC to allow gitaly to pass the `blame.markUnblamableLines` and `blame.markIgnoredLines` configuration parameters to the blame command. For example we want to facilitate something like: ``` git -c blame.markUnblamableLines=true -c blame.markIgnoredLines=true blame README.md --ignore-revs-file .git-blame-ignore-revs -p ```
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