Bug 1495397 - Update mozilla-central's package.json for being more ge…

…neric, and move existing ESLint modules to dev dependencies. r=firefox-build-system-reviewers,nalexander

packge-lock.json and tools/lint/eslint/manifest.tt were generated automatically by running tools/lint/eslint/setup.sh, as per previous revisions to package.json.

I've intentionally kept the package.json file simple for now, we can extend it as we get the requirements defined for vendoring new node modules.

Differential Revision: https://phabricator.services.mozilla.com/D7272

--HG--
extra : moz-landing-system : lando