Add an ESLint rule that check filename format
Summary:
Add a rule that enforces kebab-case names. Renamed the files using IDE so that all the references were updated.
The rule is from https://github.com/sindresorhus/eslint-plugin-unicorn/tree/main library - MIT license, 3.8k stars on GitHub.
https://linear.app/comm/issue/ENG-6819/make-sure-js-file-names-are-consistent
Test Plan: ESLint, Flow. Also checked if the web app can run.
Reviewers: inka, kamil, atul, ashoat
Reviewed By: ashoat
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D11102