test: add variable arguments support for Argv

At the moment Argv only supports three arguments which fulfilled my
requirements when working on #9163.

This commit adds support for a variable number of arguments. There is
also a no-args constructor that is the equivalent to running "node -p
process.version" which is hopefully alright as a default.

PR-URL: https://github.com/nodejs/node/pull/12166
Ref: https://github.com/nodejs/node/pull/9163


Reviewed-By: James M Snell <jasnell@gmail.com>