Show moved chunks side-by-side in diff

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Problem to solve

If large portions of code are removed from one file and added to another one, this is difficult to review.

Intended users

Developer

Further details

See for example https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14644/diffs:

Proposal

Display these changes side-by-side, so they are easier to review by line. The scope of this issue is explicitly only to handle identical chunks not similar ones.