Add missing source files in android-jarinfer-models-sdk modules

[msridhar]

These are copied from the sdk28 module. These are needed in order for the models to be loaded by the code here.

I am deliberately not adding an integration test to detect this issue right now, though I think we could using the Android sample app. The issue is that we are currently evolving the astubx format, and I don't want to be forced to re-generate these SDK models astubx files each time we make a small change. I'll open an issue so that we add the integration test once our work on astubx stabilizes and before we cut our next release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.23%. Comparing base (e2e5394) to head (f85cd97).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1033   +/-   ##
=========================================
  Coverage     87.23%   87.23%           
  Complexity     2129     2129           
=========================================
  Files            83       83           
  Lines          6965     6965           
  Branches       1356     1356           
=========================================
  Hits           6076     6076           
  Misses          458      458           
  Partials        431      431           

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