[Panlingual] numbering system and suggestion flag

1. Add numbering system for App's suggested languages.
2. Make the sugesiton flag include all sources like system, ime,
   app, sim.

Bug: 248514263
Test: atest AppLpcaleCollectorTest
Change-Id: I1342e0dbd0eabb4d59f69b5bae9c7c4fe6b72637