yarn check "commonjs correctness" option

[bestander]

Do you want to request a feature or report a bug?
Feature

What is the current behavior?

check command uses internal resolution mechanism to verify node_modules correctness.
If there is a bug in resolver then install will install node_modules incorrectly and check will fail to identify it.

New behavior

yarn check --commonjs

We need an option for "correctness" check that makes sure that node_modules is consistent with Node.js requirements independent from Yarn's resolver.

For example (#1933), React Native node_modules installed by Yarn 0.16.1 is considered incorrect by check from Yarn 0.17.4.
However node_modules is correct from Node.js resolution point of view (is it? the tests did not catch it).
This will be a good feature for e2e "correctness" checks of Yarn

[bestander]

Done #2419