R1:d7f51325e3ab

Populate results of DiffusionQueryCommitsConduitAPIMethod with DiffusionLowLevelCommitQuery

Summary:
Ref T2783. This populates the following fields in DiffusionQueryCommitsConduitAPIMethod using DiffusionLowLevelCommitQuery when `bypassCache` is set to true:

* `authorName`
* `authorEmail`
* `committerName`
* `committerEmail`
* `message`
* `hashes`

The original outline called for `authorPHID` and `committerPHID` as well (but no `message` field). As far as I can tell, the PHIDs aren't actual…