• I'd be willing to implement this feature
• This feature can already be implemented through a plugin

Describe the user story
Simple: I want to pin my node version (and, may be, in future - yarn version) via engines entry in package.json or, may be, in .yarnrc.yml

For example, deps builds are broken at node 12, but on node 10 all is OK. I want to ensure what every who try to start my project cannot use node 12.

Describe the solution you'd like
Just restore old behavior from 1.x, maybe as a (optional) plugin.

Describe the drawbacks of your solution
IDK.

Describe alternatives you've considered
IDK

Additional context
IDK