[Feature Request] `az artifacts universal` should support preemptively installing artifacttool

**Related command**

`az artifacts universal`

**Is your feature request related to a problem? Please describe.**

We have a CLI tool that spawns multiple processes to download universal artifacts. Currently, the `artifacttool` is only lazily installed before `download` or `publish`. This makes runtime behavior and performance unpredictable.

**Describe the solution you'd like**

Provide a dedicated CLI command that allows preemptively installing `artifacttool` or any other dependencies of universal artifacts.