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dns: allow --dns-verbatim to change default dns verbatim

Rodrigo Muino Tomonari requested to merge github/fork/oyyd/env-dns-verbatim into master

Allow the NODE_DNS_VERBATIM environment variable --dns-verbatim --dns-order option to change the default value of verbatim in dns.lookup().

Refs: #31566 (closed)

We already have #37931 and #20710 to change the default verbatim in the future version of Node.js. But I still want to submit this PR to see if we could accept using an environment variable option to change the default value. As this is not a semver-major change, it's also possible to backport it to Node.js v12 and v14.

This is useful when running Node.js in ipv6-only environments. When a domain supports both ipv4 and ipv6, a http request to this domain would fail as it tries to connect to the ipv4 address by default and thus emit an ENETUNREACH error.

Although we could change the family or add a customized lookup for http requests to make them succeed in ipv6-only environments, it's nearly impossible as we have to change all the code in third-party packages to make them work as expected. (Actually, this is the scenario that I have encountered.)

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