Add flag to upgrade command, to change project name

[krizzu]

Describe the Feature

So today we used upgrade in our project and we've spotted a small issue. The problem was that our name in package.json wasn't the same as the name we've initialized project with.

upgrade uses name form package.json and and applies diffing based on it, so it would be great to have a feature to override this behavior.

Possible Implementations

Just a flag --project-name passed to CLI would be sufficient. I can prepare a PR.

Thanks.

Related Issues

[grabbou]

Maybe instead of passing a flag, the upgrade script should read the name for a place where it's always correct?

We already have these utilities in the CLI (used for link) that are able to locate the application source files. We could use that to determine the name.

[krizzu]

I believe we could re-use some logic to make it happen our-of-the-box, but that could be a cumbersome task to do. IMHO, adding a flag to support it would be a faster and cleaner approach.

CC @thymikee @Esemesek

[thymikee]

@krizzu would you like to play with link's mechanisms for determining names? If it takes too much time though, I'm still good with a flag for now.