feat: add flag to show agent versions

[Dimava]

Description

This PR adds ni -V flag which shows agent and node versions additionally to ni version

PS D:\repos\ni> ni -V
@antfu/ni v0.21.6
node      v20.5.1
pnpm      v8.6.12
npm -g    v9.8.0

Why

I wanted so see the agent and node versions, same as tsx does with node version

PS D:\repos\ni> tsx -v
tsx v3.12.7
node v20.5.1

Linked Issues

none

Additional context

• not sure about flag name
• maybe a long flag name alternative is required
• this was not added to just --version because it has another format and takes a few second to run,
• maybe add versions of something else? (likely out-of-scope)
• I've made text appear in columns because I like it, but you may close to remove it
• edit: config file location also can be useful as well