diff: Integrate git-diff-pairs(1) into DiffBlobs RPC

Justin Toblerrequested to merge
jt/diff-pairs-parser into master

The DiffBlobs RPC computes diffs for a requested set of file pairs. Until the introduction of git-diff-pairs(1), Git did not have a way to compute batches for file pair diffs. This required DiffBlobs to use a separate git-diff(1) process to generate each request blob diff.

Integrate git-diff-pairs(1) into the DiffBlobs RPC and use the RawInfo field in the request to provide input. Note that git-diff(1) based parsing still remains implmented and used if the request uses BlobPairs to request diffs.

Related: #6673 (closed), #5964 (closed)

Edited by Justin Tobler

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