[automerge] Add ManifestConfigFileParser to AOSP MDD 2p: a125755bec

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/mobile-data-download/+/19194326

Bug: 238105484
Change-Id: Ib042d3395d7c0f79c4e7a1444f65f363a14e93b3