Consider enforcing development Node version using `engines` plugin

[mcmire]

The engines plugin will, when yarn is run, check the Node version specified in the engines field package.json and/or the version specified in .nvmrc and throw if the user is not using that version. This could help resolve problems when contributors outside the Wallet Framework team are working with the core repo and not using the correct version (because they haven't run nvm use).

See: https://github.com/devoto13/yarn-plugin-engines