Create enum for build info constants (#778)
Create enum for build info constants (#778)

* Create enum for build info constants so we have a consistent way of accessing the build info properties.

* Create enum for build info constants so we have a consistent way of accessing the build info properties.

* Refactor enum to have both build info key and system prop key and use for loop to populate build info dict.

* Fix debuggable spelling.

Co-authored-by: Boon Eng Oh <252eb8468cc15ba1acef2f022c185293a03e1514@google.com>
google/mobly