Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1277
Now that we have some TypeScript infra set up, move scripts (mainly the benchmarking one) and config files to TypeScript.
Starts to move away a bit from the magic globals used in the JS environment.
Reviewed By: yungsters
Differential Revision: D45511176
fbshipit-source-id: 09bb1117a1b331758ed9d210e82d5b250577df81
