Merge "Add a new module-only API to preload HttpEngine" into main am: c3a2764012 am: 90ef05c6ac

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3370478

Change-Id: Ibd203420d6851480a93aea194e7d8b8cf1249242
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>