tools: add eslint rule for inspector checking

The motivation for this commit is to pick up early on missing checks for
inspector support (when Node is built --without-inspector).

PR-URL: https://github.com/nodejs/node/pull/13813


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>