Refactor lib/facts files from JSON to JS

Summary:
This commit deals with ENG-1181, part of the parent issue ENG-929. ENG-1181 handles refactoring the lib/facts files from JSON into JS, and fixing some import statements.

Commandeering this revision from some previous work.

Test Plan: Both Web and Native seem functional to me. Messages still load as expected, and created several new accounts to test the Genesis bot (results are identical with these changes and on the current master branch).

Reviewers: ashoat, atul, ginsu

Reviewed By: ashoat, atul, ginsu

Subscribers: ashoat, tomek, abosh

Differential Revision: https://phab.comm.dev/D5107