engines support

[sakulstra]

Hello,
It would be great if setup-node would automatically pick the correct version specified in our package.json engines property.

We're using github actions for 7 packages now and while all have an .nvmrc & specified engines still have to use the workaround provided in: #32 (comment)

Related to: #32, #26

[bryanmacfarlane]

Will track the work with #32. If there's anything in addition to what's in that issue, can you add a comment to that one? I would like to capture all the similar work in one place. Thanks!