Support per-process useEmbeddedDex opt-in

Extend the useEmbeddedDex attribute to allow opt-in at the <process>
level. Note that if the parent application has opted in to
useEmbeddedDex, that will override any value set at the process level.

This configuration is useful for lighter weight processes that don't
rely heavily on the usual set of dex compilation optimizations critical
for the usual set of app CUJs (e.g., app startup).

Bug: 295870718
Test: atest android.appsecurity.cts.UseEmbeddedDexTest
Change-Id: Ic50ae2e1c568006cb3199013889a91fe38afc9d0