feat: add prefix for version output

[cyntler]

Today, after installing Brew on the new MacOS and then Node, I checked the version of both binaries.
I saw that node -v displays the version as vX.X.X but npm as X.X.X.

I decided to standardize it.
A simple change.

[wraithgar]

A deceptively simple change. This is likely a discussion that would have to be made through our rfc process. We would need to see if this is even possible (it likely is not because this is the programmatic output for that flag i.e. no --json output), and if so if a bare v is the right thing to prepend. There are the tag-version-prefix and save-prefix flags to consider.

[ljharb]

This is a great idea but will definitely break many of the tools that have had to work around npm's lack of a v for a decade.

[wraithgar]

This was discussed at today's open rfc meeting and it was determined that this would definitely be a breaking change. If you want to propose a way to implement this in a backwards-compatible way, feel free to open an rfc issue.