[Feature] Add `yarn upgrade` as an alias for `yarn up`

• I'd be willing to implement this feature (Possibly, but not in the very near-term)
• This feature can already be implemented through a plugin

Describe the user story

Exploring using berry for my team's project, I found that when I ran yarn upgrade typescript (the same command I would use in v1), I got an unhelpful error message:

PS E:\VSO\typescript-repro> yarn upgrade typescript@latest
Error: Couldn't find a script named "upgrade".

Usage: run <name> [... args] [-T,--top-level]

Describe the solution you'd like

Berry should either add yarn upgrade as an alias for yarn up, for backwards compatibility,or at least add a custom error message directing the user to the new CLI command.

This likely applies to other commands as well.

Describe the drawbacks of your solution

The only drawback I see is that it removes upgrade as a package script that can be run without having to use yarn run upgrade

Start by locating the CLI handling for yarn up and the error path that treats upgrade as a script, then check how existing command aliases are tested. Done means yarn upgrade typescript@latest behaves like yarn up typescript@latest, or produces a clear message directing users to the new command.