Allow the ability to pass env vars into the babel playground

[lifeiscontent]

Feature Request

Allow the ability to pass ENV vars into the babel playground, some plugins only work when a certain NODE_ENV is set, e.g. when prop-types are removed from react in production envs.

[babel-bot]

Hey @lifeiscontent! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

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