Add ability to request commit_ids from FindChangedPaths

John Cairequested to merge
jc/return-commit-id into master

When commits are provided, the resulting response doesn't make it clear which changed paths are associated with which commits. Let's provide the ability for clients to request that commit ids be included in the response of changed paths through a new parameter in the protobuf definition.

fixes: #6950 (closed)

Edited by John Cai

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