Add module-defined APIs to module-(app|lib)

These APIs should really leave in individual .txt files,
but had them here for the moment to make sure there is *some*
tracking of the surface.

Bug: 147768409
Test: m module-app-api-check-current-api
Test: m module-lib-api-check-current-api
Test: patch I97ef83f7f9b4c1376f373713036f5256318f1050 && the above `m`
Change-Id: Ia0a48b9f6e45fccbe67b369b61660d88b5000a44