Please add authentication support for NodeJS Dist mirrors

[grepwood]

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I'm working with NVM in an environment where I can't access the Internet. My only way to access https://nodejs.org/dist is through a server that is blessed with a very restricted Internet access. However, accessing stuff through it like a proxy is not possible without authentication.

Please accommodate such a use case as I can't find anything other than this, as a means of support: https://github.com/nvm-sh/nvm/compare/master...DanielK2013:nvm:master