Accept --dry-run as a synonym (alias) to --preview

[Septh]

Description

As the clig says:

Where possible, a CLI should follow patterns that already exist. That’s what makes CLIs intuitive and guessable; that’s what makes users efficient.

npm uses --dry-run.
yarn uses --dry-run.
pnpm uses --dry-run.
git uses --dry-run.

I think np should support --dry-run as well.

Also, because misusing np could potentially lead to catastrophic consequences, maybe np should reject unknown CLI flags rather than simply ignore them. I for one wish it had rejected --dry-run that I just mistakenly used instead of --preview 😬.

WDYT?