CommitDiffRequest: Introduce `WhitespaceChanges`

Karthik Nayakrequested to merge
4546-introduce-new-whitespacechanges-enum-and-deprecate-ignore_whitespace_change into master

In the CommitDiffRequest message, introduce a new enum WhitespaceChanges and a corresponding field whitespace_changes. This field will allow us to decide between --ignore-all-space, --ignore-space-change or no none.

This field also overshadows the earlier field ignore_whitespace_change which was a boolean value and could not be extended. The field ignore_whitespace_change is now marked as deprecated.

Closes #4546 (closed)

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